// JavaScript Document
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(dot,(lat+2))==-1)
		{
	    alert("Invalid E-mail ID")
		return false
		}
		
	if (lstr==ldot || (ldot+1)==lstr )
		{
		alert("Invalid E-mail ID")
		return false
		}
	return true					
	}

function Check_type(field)
	{
	var valid = "0123456789.- ";
	var ok = "yes";
	var temp;
	for (var i=0; i<field.value.length; i++)
		{
		temp = "" + field.value.substring(i, i+1);
		if (valid.indexOf(temp) == "-1")
				 ok = "no";
		}
	if (ok == "no") 
		{	
		alert("Enter Numbers Only");	
		field.value="0"
		return false;		  
		}
	}		

function form_val()
{
  
  frm=document.form;
 
  if (frm.firstName.value == "")
  {
    alert("Please enter a value for the 'Name' field."); 
    frm.firstName.focus();
    return false;
  }
  
 else if ((frm.email.value==null)||(frm.email.value==""))
		{
		alert("Please Enter your Email ID");
		frm.email.focus();
		return false;
		}
 else if (echeck(frm.email.value)==false)
		{
		frm.email.value="";
		frm.email.focus();
		return false;
		}	

 else if(frm.telephone.value=="")
		{
		alert("Please Enter Your Phone Number");
		frm.telephone.focus();
		return false;
		}	
 else if(frm.comments.value=="")
 		{
		alert("Your comments should not be blank.")
		frm.comments.focus();
		return false;
		}		
 
 	return true;
}