//
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 signup_form()
{
	var lname = document.getElementById("lname");
	var fname = document.getElementById("fname");
	var email = document.getElementById("email");
	var message = "";
	
	if (isBlank(fname.value)) { message = message + "Please Enter Your First Name!\n"; }
	if (isBlank(lname.value)) { message = message + "Please Enter Your Last Name!\n"; }
	if (isBlank(email.value)) { message = message + "Please Enter Your Email!\n"; }
	
	if (message != "") { alert(message); return false; }
	else { return true; }
}

function validate_signup()
{
	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;
	}
}