String.prototype.trim = function() 
{   
	return( this.replace(/^\s*([\s\S]*\S+)\s*$|^\s*$/,'$1') );  
} 

function Under18Years()
{
	var dob =new Date(document.getElementById("dobYear").value,document.getElementById("dobMonth").value,document.getElementById("dobDay").value);
	var today=new Date();
	dob=dob.setFullYear(dob.getFullYear()+18);
	return today<dob;
}
function IsValidPostalCode(code)
{
	return /^([a-z]\d[a-z])[\s-]*(\d[a-z]\d)$/i.test(code);
}
function IsValidPhoneNumber(segment1,segment2,segment3)
{
	return /\d{10}/.test(segment1+segment2+segment3);
	
}
function IsValidEmail(email)
{
	return /^\w+([\.\-_]?\w+)*@\w+([\.\-_]?\w+)*(\.\w{2,5})+$/.test(email);
}			
function IsValidDob(year,month,day)
{
	if(year=="" || month=="" || day=="")
	{
		return false;
	}
	
	var dob=new Date(year,month-1,day);
	if(dob.getFullYear()!=year)
	{
		return false;
	}
	if(dob.getMonth()!=month-1)
	{
		return false;
	}
	if(dob.getDate()!=day)
	{
		return false;
	}
	return true;
	
}
function FormatErrorString(text)
{
	return "* " + text + "<br>";
}
function IsValidEntry()
{
	try
	{	
		var errorMsgs="";
		var errorsSection=document.getElementById("errorMsg");
		if(document.getElementById("Name").value.trim().length==0)
		{
				errorMsgs+=FormatErrorString("Please enter First Name");		
		}
		if(document.getElementById("Surname").value.trim().length==0)
		{
				errorMsgs+=FormatErrorString("Please enter Last Name");
		}
		if(document.getElementById("Address").value.trim().length==0)
		{
				errorMsgs+=FormatErrorString("Please enter Address");
		}
		if(document.getElementById("City").value.trim().length==0)
		{
				errorMsgs+=FormatErrorString("Please enter City");
		}
		if(document.getElementById("Province").value.length==0)
		{
				errorMsgs+=FormatErrorString("Please select Province");
		}
		if(!IsValidPostalCode(document.getElementById("PostalCode1").value+ document.getElementById("PostalCode2").value))
		{
				errorMsgs+=FormatErrorString("Please enter Postal Code");
		}
/*		if(!IsValidDob(document.getElementById("DobYear").value,document.getElementById("DobMonth").value,document.getElementById("DobDay").value))
		{
				errorMsgs+=FormatErrorString("Please enter Date of Birth");
		}
*/		if(!IsValidPhoneNumber(document.getElementById("HomePhone1").value.trim(),document.getElementById("HomePhone2").value.trim(),document.getElementById("HomePhone3").value.trim()))
		{
				errorMsgs+=FormatErrorString("Please enter Telephone Number");
		}
		if(!IsValidEmail(document.getElementById("Email").value.trim()))
		{
				errorMsgs+=FormatErrorString("Please enter Email Address");
		}
/*		if(document.getElementById("Recipe").value.length==0)
		{
				errorMsgs+=FormatErrorString("Please select Recipe");
		}
*/		if(!document.getElementById("cbConfirmCompliance").checked)
		{
				errorMsgs+=FormatErrorString("You must with comply with the contest rules and regulations by clicking the box");
		}
		//check friends' email addresses
		for(var i=1;i<=9;i++)
		{
			var email=document.getElementById("FriendEmail"+i).value;
			if(email.trim().length>0 && !IsValidEmail(email.trim()) )
			{
				errorMsgs+=FormatErrorString("The friend’s email address you entered is incorrect. Please correct and try again");
				break;
			}
		}
		
		if(errorMsgs.length>0)
		{
			errorsSection.className="error";
			errorsSection.innerHTML=errorMsgs;
			return false;
		}
		else
		{
			errorsSection.className="noerror";
			return true;
		}
	}
	catch(e)
	{
		return true;
	}
}
function ValidateEntry()
{	
	if(!IsValidEntry())
	{	
		document.location.href="#errorSection";
		return false;
	}
/*	if(Under18Years())
	{
		DisplayCenteredWindow("underage.html",568,528);
		return false;
	}	
*/			
	return true;
	
}

function DisplayCenteredWindow(url,width,height,params)
{
	if(typeof width=="undefined")
	{
		width=screen.width;
	}
	if(typeof height=="undefined")
	{
		height=screen.height;
	}
	if(typeof params=="undefined")
	{
		params="toolbar=no, menubar=no, scrollbars=no, status=no, resizable=no, location=no, directories=no";
	}
	
	var posX = ( screen.width - width ) / 2;
	var posY = ( screen.height - height ) / 2; 
	window.open(url,"_blank","HEIGHT="+height+", WIDTH="+width+",Left="+posX+ ",Top="+posY+", " +params);
	
}
function limitText(entity,limit)
{
	if(entity.value.length>limit)
	{
		entity.value=entity.value.substring(0,limit);
		return false;
	}
}
function EnsureCorrectPostalCode(ev,data,pattern)
{
	try
	{
		var expectsLetter=pattern.charAt(data.length)=="l";
		var cKey=ev.which==undefined?ev.keyCode:ev.which;
		
		if(cKey==8) 
		{
			//backspace
			return true;
		}
		var number= cKey>=48 && cKey<=57;
		var letter= cKey>=65 && cKey<=122;
		if(!number&& !letter)
		{
			return false;
		}
		return expectsLetter == letter;
	}
	catch(e)
	{
		return true;
	}
}
function EnsureNumeric(ev)
{
	try
	{
		var cKey=ev.which==undefined?ev.keyCode:ev.which;
		if(cKey==8) 
		{
			//backspace
			return true;
		}
		return cKey>=48 && cKey<=57;
	}
	catch(e)
	{
		return true;
	}
}
function ClearDefault(element,pattern)
{
	if(element.value==pattern)
	{
		element.value="";
	}
}