// JavaScript Document
function check()

{
	if(document.asg.username.value=="")
	{
	alert('Please enter username');
	asg.username.focus();
	return false;
	}
	else if(document.asg.username.value.length < 6)
	{
    alert('The username must contain at least 6 characters');
	asg.username.focus();
	return false;
	}
	else if(document.asg.password.value=="")
	{
	alert('Please enter password');
	asg.password.focus();
	return false;
	}
	else if(document.asg.password.value.length < 6)
	{
    alert('The password must contain at least 6 characters');
	asg.username.focus();
	return false;
	}
	else if(document.asg.password.value!=document.asg.confirmpassword.value)
	{
	alert('Your password does not match');
	asg.confirmpassword.focus();
	return false;
	}
	else if(!emailCheck(document.asg.email.value))
		{
			
			document.asg.email.focus();
			return false;
		}

	else if(document.asg.email.value!=document.asg.confirmemail.value)
	{
	alert('Your email does not match');
	asg.confirmemail.focus();
	return false;
	}
	else if(document.asg.location.value=="")
	{
		alert('Please enter your location');
		asg.location.focus();
		return false;
	}
	else if(document.asg.question.checked == false)
	{
	alert('Please Check the Box to Signify Agreement of Our Terms of Use.');
	asg.question.focus();
	return false;
	}
}
		// Email validation function
		function emailCheck (emailStr) 
		{

		var checkTLD=1;
		var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;
		var emailPat=/^(.+)@(.+)$/;
		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];
		
		for (i=0; i<user.length; i++)
		 {
			if (user.charCodeAt(i)>127) 
			{
				alert("Ths username contains invalid characters.");
				return false;
	  		 }
		}
		for (i=0; i<domain.length; i++) 
		{
			if (domain.charCodeAt(i)>127) 
			{
				alert("Ths domain name contains invalid characters.");
				return false;
	  		 }
		}
	
	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 atomPat=new RegExp("^" + atom + "$");
	var domArr=domain.split(".");
	var len=domArr.length;
	for (i=0;i<len;i++) 
	{
		if (domArr[i].search(atomPat)==-1)
		{
			alert("The domain name does not seem to be valid.");
			return false;
	   }
	}
	
	if (checkTLD && domArr[domArr.length-1].length!=2 && domArr[domArr.length-1].search(knownDomsPat)==-1) 
	{
		alert("The address must end in a well-known domain or two letter " + "country.");
		return false;
	}
	if (len<2) 
	{
		alert("This address is missing a hostname!");
		return false;
	}
		return true;
	}