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("Please enter a valid email address");
	   return false;
	}
	
	if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr)
	{
	   alert("Please enter a valid email address");
	   return false;
	}
	
	if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr)
	{
		alert("Please enter a valid email address");
		return false;
	}
	
	if (str.indexOf(at,(lat+1))!=-1)
	 {
		alert("Please enter a valid email address");
		return false;
	 }
	
	 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot)
	 {
		alert("Please enter a valid email address");
		return false;
	 }
	
	 if (str.indexOf(dot,(lat+2))==-1)
	 {
		alert("Please enter a valid email address");
		return false;
	 }
	
	 if (str.indexOf(" ")!=-1)
	 {
		alert("Please enter a valid email address");
		return false;
	 }
	 return true;		
	}

function Validate(form_id)
{
	var emailID = getElement(form_id).email;
	if ((emailID.value==null)||(emailID.value==""))
	{
		alert("Please enter your email address");
		emailID.focus();
		return false;
	}
	if (echeck(emailID.value)==false)
	{
		emailID.value="";
		emailID.focus();
		return false;
	}
	//return true;
 }
 
function getElement(psID)
{
    if(document.getElementById)
    {
	    //alert('getElementById : '+psID);
	    return document.getElementById(psID);
    }
    else if(document.all)
    {
	    //alert('all : '+psID);
	    return document.all[psID];
    }
    else
    {
	    //alert('layers : '+psID);
	    for (iLayer = 1; iLayer < document.layers.length; iLayer++)
	    {
		    if(document.layers[iLayer].id == psID)
            return document.layers[iLayer];
	    }      
    }
    return Null;
}