function isAlphaNumeric(str)
	{
		var re = /[^a-zA-Z0-9-]/g
		if (re.test(str)) return false;
		return true;
	}
	function isZipCode(str)
	{
		var re = /[^0-9 -]/
		if (re.test(str)) return false;
		return true;
	}
	function isPhoneNumber(str)
	{
		var re = /[^0-9 -()]/
		if (re.test(str)) return false;
		return true;
	}
	function emailCheck (emailStr) 
	{
		var emailPat=/^(.+)@(.+)$/
		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=emailStr.match(emailPat)
		if (matchArray==null)
		{
			alert("Email address seems incorrect (check @ and .'s)");
			return false
		}
			var user=matchArray[1]
			var domain=matchArray[2]

		if (user.match(userPat)==null) 
		{
			alert("The username doesn't seem to be valid.");
			return false
		}
		var IPArray=domain.match(ipDomainPat)
		if (IPArray!=null)
		{
			for (var i=1;i<=4;i++) 
			{
				if (IPArray[i]>255)
				{
					alert("Destination IP address is invalid!");
					return false
				}
			}
					return true
		}	
		var domainArray=domain.match(domainPat)
		if (domainArray==null) 
		{
			alert("The domain name doesn't seem to be valid.");
			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("The address must end in a three-letter domain, or two letter country.");
			return false
		} 
		if (len<2) 
		{
			var errStr="This address is missing a hostname!"
			alert(errStr);
			return false
		}
			return true;
	  }	
	function valid()
	{
    		
	
		if(document.login.full_name.value== "")
		{
			alert("Please Enter Contact's Name");
			return false;
		}
		
		
		if(document.login.email.value == "")
		{
			alert("Please Enter Email-id");
			return false;
		}	
		else if(emailCheck(document.login.email.value) == false)
		{
               return false;
		}		
		
		<!-- RUPESH CODE -->
		if(document.login.security_code.value== "")
		{
			alert("Please Enter Code");
			return false;
		}
		else
		{
			return true;
		}
		<!-- RUPESH CODE -->
		
		
			
    }