// JavaScript Document
function isEmpty()
{
	if(document.frminvite.sec_ques.value == '-1')
	{
		alert("Please Select the Question.");
		return false;
	}
	
	if(document.frminvite.txtans.value == '')
	{
		alert("Please enter answer of question.");
		return false;
	}
	if((document.frminvite.txtuserid.value.length >0) && (document.frminvite.txtEmail.value.length <=0 ))
	{
		return true;
	}
	else if((document.frminvite.txtEmail.value.length >0) && (document.frminvite.txtuserid.value.length <=0)) 
	{
		if(isValidEmail())
			return true;
		else
			return false;		
	}
	else
	{
		alert("Please Enter either Userid or E-Mail to get your UserId and Password.");
		return false;
	}
	

return true;

}
function isValidEmail()
{	
	//if ((emailID.value==null)||(emailID.value==""))
	var emailID;
	if(document.frminvite.txtEmail.value=="" && document.frminvite.txtuserid.value!="")
		return true;
	if(document.frminvite.txtEmail.value=="")
	{
		alert("Please Enter Email ID");
		document.frminvite.txtEmail.focus();
		return false;
	}
	else
	{
		emailID=document.frminvite.txtEmail.value;
	}
	if (echeck(emailID)==false)
	{
		emailID="";
		document.frminvite.txtEmail.focus();
		return false;
	}
	return true;
}
 
function echeck(str)
{

		var at="@"
		var dot="."
		
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		if (str.indexOf(at)==-1)
		{
		   alert("Invalid E-mail ID");
		   return false;
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Invalid E-mail ID");
		   return false;
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Invalid E-mail ID");
		    return false;
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Invalid E-mail ID");
		    return false;
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Invalid E-mail ID");
		    return false;
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("Invalid E-mail ID");
		    return false;
		 }
		
		 if (str.indexOf(" ")!=-1){
		    alert("Invalid E-mail ID");
		    return false;
		 }

 		 return true;			
}