function Display()
	{
		mask.style.width=document.body.scrollWidth;
		mask.style.height=document.body.scrollHeight;
		mask.style.visibility='visible';
		email.style.visibility='visible';
	}
	function checkMail(){
		theStr=document.form1.email.value;
		if(theStr.length==0)
		{
				alert("E-mail Address is not null");
				document.form1.email.focus();
				return false;
		}
		else
		{
		    var atIndex = theStr.indexOf('@');
		    var dotIndex = theStr.indexOf('.', atIndex);
		    theSub = theStr.substring(0, dotIndex+1);
		    if ((atIndex < 1)||(atIndex != theStr.lastIndexOf('@'))||(dotIndex < atIndex + 2)||(theStr.length <= theSub.length)) 
		    {    
			   alert("E-mail Address is invalidation");
			   document.form1.email.focus();
			   return false;
		    }
		}
		    return true;	 
	} 
	function closewindow()
	{
		mask.style.visibility='hidden';
		email.style.visibility='hidden';
	}