function isBlank(s)
	{
		var len,k,flg;
		flg=true;
		if(s!=null)
		{
			len=s.length;
			for(k=0;k<len;k++)
			{
				if(s.substring(k,k+1) != " ")
				flg=false;
			}
		}
		return flg;
	}
	
	function validate()
	{
		var emailaddressStr1 = window.document.frmEmail.emailaddress.value;
		if(isBlank(emailaddressStr1))
		{
			alert("Please enter E-Mail address.");
			window.document.frmEmail.emailaddress.value="";
			window.document.frmEmail.emailaddress.focus();
			return false;
		}
		var emailaddressPat=/^(.+)@(.+)$/
		var specialChars="\\(\\)<>\\@%&,;:\\\\\\\"\\.\\[\\]"
		var validChars="\[^\\s" + specialChars + "\]"
		var quotedUser="(\"[^\"]*\")"
		var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/
		var atom=validChars + '+'
		var word="(" + atom + "|" + quotedUser + ")"
		var userPat=new RegExp("^" + word + "(\\." + word + ")*$")
		var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$")

		var matchArray=emailaddressStr1.match(emailaddressPat);
		if (matchArray==null)
		{
			alert("Please enter valid E-Mail address.");
			window.document.frmEmail.emailaddress.value="";
			window.document.frmEmail.emailaddress.focus();
			return false;
		}
		var user=matchArray[1]
		var domain=matchArray[2]

		if (user.match(userPat)==null)
		{
		    alert("Please enter valid E-Mail address.");
		    window.document.frmEmail.emailaddress.value="";
			window.document.frmEmail.emailaddress.focus();
		    return false;
		}

		var IPArray=domain.match(ipDomainPat);
		if (IPArray!=null)
		{
			  for (var i=1;i<=4;i++) {
			    if (IPArray[i]>255) {
			        alert("Please enter valid E-Mail address.");
			       	window.document.frmEmail.emailaddress.value="";
					window.document.frmEmail.emailaddress.focus();
					return false;
			    }
		    }
		}

		var domainArray=domain.match(domainPat);
		if (domainArray==null)
		{
			alert("Please enter valid E-Mail address.");
			window.document.frmEmail.emailaddress.value="";
			window.document.frmEmail.emailaddress.focus();
			return false;
		}

		var atomPat=new RegExp(atom,"g");
		var domArr=domain.match(atomPat);
		var len=domArr.length;
		if (domArr[domArr.length-1].length<2 || domArr[domArr.length-1].length>3)
		{
		   alert("Please enter valid E-Mail address.");
		   window.document.frmEmail.emailaddress.value="";
		   window.document.frmEmail.emailaddress.focus();
		   return false;
		}
		if (len<2)
		{
		   var errStr="Please enter valid E-Mail address.";
		   alert(errStr);
		   window.document.frmEmail.emailaddress.value="";
		   window.document.frmEmail.emailaddress.focus();
		   return false;
		}
	}
	
	function blank()
	{
			window.document.frmEmail.emailaddress.value=""
	}