var digits = "0123456789";
var phoneNumberDelimiters = "()- ";
var validWorldPhoneChars = phoneNumberDelimiters + "+";
var minDigitsInIPhoneNumber = 10;

function isInteger(s)
{   var i;
    for (i = 0; i < s.length; i++)
    {   
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    return true;
}

function stripCharsInBag(s, bag)
{   var i;
    var returnString = "";
    for (i = 0; i < s.length; i++)
    {   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function checkInternationalPhone(strPhone){
s=stripCharsInBag(strPhone,validWorldPhoneChars);
return (isInteger(s) && s.length >= minDigitsInIPhoneNumber);
}

var emailFilter=/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/;

function checkForm()
{
   var ch_fname, ch_lname, ch_contact, ch_email;      
   with(window.document.cform)
   {
      ch_fname    = fname;
      ch_lname   = lname;
	  ch_contact   = contact;
      ch_email = email;
   }
		var at="@"
		var dot="."
		var str=ch_email.value
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)		
		var atpos=str.indexOf(at)
		var dotpos=str.indexOf(dot)
		var dname= str.substring(atpos+1, dotpos)
		
   if(trim(ch_fname.value) == '')
   {
      alert('Please enter your First Name');
      ch_fname.focus();
      return false;	 
   }
   else if(trim(ch_lname.value) == '')
   {
      alert('Please enter your Last Name');
      ch_lname.focus();
      return false;	  
   }
   
   else if(trim(ch_email.value) == '')
   {
      alert('Please enter your Email');
      ch_email.focus();
      return false;	  
   }
   
	else if (!(emailFilter.test(ch_email.value))) { 
       alert("Please enter a valid email address.");
	   ch_email.focus()
	   return false
	}
	
   else if(trim(ch_contact.value) == '')
   {
      alert('Please enter your Contact Number');
      ch_contact.focus();
      return false;	  
   }  
   else if (checkInternationalPhone(ch_contact.value)==false){
		alert("Please Enter a Valid Phone Number")
		ch_contact.focus()
		return false
	}
      
	/*
	else if (dname=="gmail" || dname=="yahoo" || dname=="rediff" || dname=="rediffmail" || dname=="hotmail") { 
       alert("Please enter Business Email Address.. Don't use personal");
	   ch_email.focus()
	   return false
	}
	*/
   
   else
   {      
	 cform.submit();
      return true;	  
   }
}

function trim(str)
{
   return str.replace(/^\s+|\s+$/g,'');
}