///////////////////////////////////////////////////////////
// Usage IEprompt("dialog descriptive text", "default starting value");
// 
// IEprompt will call promptCallback(val)
// Where val is the user's input or null if the dialog was canceled.
///////////////////////////////////////////////////////////

///////////////////////////////////////////////////////////
// This source code has been released into the public domain
// January 14th, 2007.
// You may use it and modify it freely without compensation
// and without the need to tell everyone where you got it.
///////////////////////////////////////////////////////////


///////////////////////////////////////////////////////////
// You must create a promptCallback(val) function to handle
// the user input.  If you don't this script will fail and
// Bunnies will die.
///////////////////////////////////////////////////////////


///////////////////////////////////////////////////////////
// These are global scope variables, they should remain global.
///////////////////////////////////////////////////////////
var _dialogPromptID=null;
var _blackoutPromptID=null;
///////////////////////////////////////////////////////////

function IEprompt(innertxt,def) {

   that=this;

   // Check to see if this is MSIE 7.   This isn't a great general purpose
   // detection system but it works well enough just to find MSIE 7.
   var _isIE7=(navigator.userAgent.indexOf('MSIE 7')>0);

   this.wrapupPrompt = function (cancled) {
      // wrapupPrompt is called when the user enters or cancels the box.
      // It's called only by the IE7 dialog box, not the non IE prompt box
      if (_isIE7) {
         // Make sure we're in IE7 mode and get the text box value
         val=document.getElementById('iepromptfield').value;
         // clear out the dialog box
         _dialogPromptID.style.display='none';
         // clear out the screen
         _blackoutPromptID.style.display='none';
         // clear out the text field
         document.getElementById('iepromptfield').value = '';
         // if the cancel button was pushed, force value to null.
         if (cancled) { val = '' }
         // call the user's function
         promptCallback(val);
      }
      return false;
   }

   //if def wasn't actually passed, initialize it to null
   if (def==undefined) { def=''; }

   if (_isIE7) {
      // If this is MSIE 7.0 then...
      if (_dialogPromptID==null) {
         // Check to see if we've created the dialog divisions.
         // This block sets up the divisons
         // Get the body tag in the dom
         var tbody = document.getElementsByTagName("body")[0];
         // create a new division
         tnode = document.createElement('div');
         // name it
         tnode.id='IEPromptBox';
         // attach the new division to the body tag
         tbody.appendChild(tnode);
         // and save the element reference in a global variable
         _dialogPromptID=document.getElementById('IEPromptBox');
         // Create a new division (blackout)
         tnode = document.createElement('div');
         // name it.
         tnode.id='promptBlackout';
         // attach it to body.
         tbody.appendChild(tnode);
         // And get the element reference
         _blackoutPromptID=document.getElementById('promptBlackout');
         // assign the styles to the blackout division.
         _blackoutPromptID.style.opacity='.9';
         _blackoutPromptID.style.position='absolute';
         _blackoutPromptID.style.top='0px';
         _blackoutPromptID.style.left='0px';
         _blackoutPromptID.style.backgroundColor='#555555';
         _blackoutPromptID.style.filter='alpha(opacity=100)';
         _blackoutPromptID.style.height=(document.body.offsetHeight<screen.height) ? screen.height+'px' : document.body.offsetHeight+20+'px'; 
         _blackoutPromptID.style.display='block';
         _blackoutPromptID.style.zIndex='50';
         // assign the styles to the dialog box
         _dialogPromptID.style.border='0px solid blue';
         _dialogPromptID.style.backgroundColor='#DDDDDD';
         _dialogPromptID.style.position='absolute';
         _dialogPromptID.style.width='330px';
         _dialogPromptID.style.zIndex='100';
      }
      // This is the HTML which makes up the dialog box, it will be inserted into
      // innerHTML later. We insert into a temporary variable because
      // it's very, very slow doing multiple innerHTML injections, it's much
      // more efficient to use a variable and then do one LARGE injection.
      //var tmp = '<div style="width: 100%; background-color: blue; color: white; font-family: verdana; font-size: 10pt; font-weight: bold; height: 20px">Birthday Required</div>';
      tmp = '<div style="padding: 10px">'+innertxt + '<BR><BR>';
      tmp += '<form action="" onsubmit="return that.wrapupPrompt()">';
      tmp += '<input id="iepromptfield" name="iepromptdata" type=text size=46 value="'+def+'">';
      tmp += '<br><br><center>';
      tmp += '<input type="submit" value="&nbsp;&nbsp;&nbsp;OK&nbsp;&nbsp;&nbsp;">';
      tmp += '&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;';
      tmp += '<input type="button" onclick="that.wrapupPrompt(true)" value="&nbsp;Cancel&nbsp;">';
      tmp += '</form></div>';
      // Stretch the blackout division to fill the entire document
      // and make it visible.  Because it has a high z-index it should
      // make all other elements on the page unclickable.
      
      _blackoutPromptID.style.height=(document.body.offsetHeight<screen.height) ? screen.height+2000+'px' : document.body.offsetHeight+2000+'px'; 
      _blackoutPromptID.style.width= screen.width+'px';
      _blackoutPromptID.style.display='block';
      // Insert the tmp HTML string into the dialog box.
      // Then position the dialog box on the screen and make it visible.
      _dialogPromptID.innerHTML=tmp;
      _dialogPromptID.style.top=parseInt(document.documentElement.scrollTop+(screen.height/3))+'px';
      _dialogPromptID.style.left=parseInt((document.body.offsetWidth-315)/2)+'px';
      _dialogPromptID.style.display='block';
      
      // Give the dialog box's input field the focus.
      document.getElementById('iepromptfield').focus();
   } else {
      // we are not using IE7 so do things "normally"
      promptCallback(prompt(innertxt,def));
   }
}






// Declaring valid date character, minimum year and maximum year
var dtCh= "/";
var minYear=1900;
var maxYear=2100;

function isInteger(s){
	var i;
    for (i = 0; i < s.length; i++){   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag){
	var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}

function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
   } 
   return this
}


function testForObject(Id, Tag)
{
  var o = document.getElementById(Id);
  if (o)
  {
    if (Tag)
    {
      if (o.tagName.toLowerCase() == Tag.toLowerCase())
      {
        return o;
      }
    }
    else
    {
      return o;
    }
  }
  return null;
}


function isDate(dtStr){
	
	var promptBlackOutExist = testForObject("promptBlackout", "div");
	if (promptBlackOutExist)
	{
		_blackoutPromptID=document.getElementById('promptBlackout');
		// assign the styles to the blackout division.
		_blackoutPromptID.style.opacity='.9';
		_blackoutPromptID.style.filter='alpha(opacity=100)';
		_blackoutPromptID.style.display='block';	
	}

	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	var strMonth=dtStr.substring(0,pos1)
	var strDay=dtStr.substring(pos1+1,pos2)
	var strYear=dtStr.substring(pos2+1)
	strYr=strYear
	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
	}
	month=parseInt(strMonth)
	day=parseInt(strDay)
	year=parseInt(strYr)
	if (pos1==-1 || pos2==-1){
		alert("The date format should be : mm/dd/yyyy")
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		alert("Please enter a valid month")
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		alert("Please enter a valid day")
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear)
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		alert("Please enter a valid date")
		return false
	}
return true
}

function readBirthDate (){
	IE7 = ((document.all)&&(navigator.appVersion.indexOf("MSIE 7.")!=-1)) ? true : false;
	if(IE7)
	{
		document.body.style.overflow="hidden";
		IEprompt("Enter your birthday in mm/dd/yyyy format","mm/dd/yyyy");
	}else
	{
		var birthDay=prompt("Enter your birthday in mm/dd/yyyy format","mm/dd/yyyy");
	 	if(!birthDay){
	 		alert("Redirecting to homepage\n");
	 		window.location = "http://carolinaspurerock.com";
	 		return false;
	 	}
		if (isDate(birthDay)){
			return birthDay;
		}else{
			return readBirthDate();
		}
	}
}