function isValidEmail(email, required) 
{
    if (required==undefined) 
	{   // if not specified, assume it's required
        required=true;
    }

    if (email==null) 
	{
        if (required) 
		{
            return false;
        }
        //return true;
    }

    if (email.length==0) 
	{  
        if (required) 
		{
            return false;
        }
        //return true;
    }

    if (! allValidChars(email)) 
	{  // check to make sure all characters are valid
        return false;
    }

    if (email.indexOf("@") < 1)
	{ //  must contain @, and it must not be the first character
        return false;
    }
	
	else if (email.lastIndexOf(".") <= email.indexOf("@")) 
	{  // last dot must be after the @
        return false;
    } 

	else if (email.indexOf("@") == email.length) 
	{  // @ must not be the last character
        return false;
    } 

	else if (email.indexOf("..") >=0) 
	{ // two periods in a row is not valid
		return false;
    } 

	else if (email.indexOf(".") == email.length) 
	{  // . must not be the last character
		return false;
    }

	return true;
}

function allValidChars(email) {
  var parsed = true;
  var validchars = "abcdefghijklmnopqrstuvwxyz0123456789@.-_";
  for (var i=0; i < email.length; i++) {
    var letter = email.charAt(i).toLowerCase();
    if (validchars.indexOf(letter) != -1)
      continue;
    parsed = false;
    break;
  }
  return parsed;
}


function ValidateForm()
{
	var name = document.getElementById("name");
	var emailID = document.getElementById("email").value;
	var opt = document.getElementById("opt");

	if ((name.value==null)||(name.value==""))
	{
		alert("Please Enter your Name");
		name.value="";
		name.focus();
		return false;
	}
	
	if (! isValidEmail(emailID))
	{
        alert("Please enter a valid email address");
		document.getElementById("email").focus();
        return false;
    }

	if(opt.selectedIndex == -1)
	{
		alert("Please select a Product from the Drop down list");
		opt.focus();
        return false;
	}

	return true;
 }