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;
}



function validate_form(theForm) {
var reason = "";

//reason += validateEmpty(theForm.title);
reason += validateEmpty(theForm.FirstName);
reason += validateEmpty(theForm.LastName);
reason += validateEmpty(theForm.Message);
reason += validateEmpty(theForm.Email);
if (reason != "") {
alert("Please fill out all of the required fields!");
return false;
}
if ((theForm.Email.value==null)||(theForm.Email.value==""))
{
alert("Empty Email field ");
return false;
}
else if (echeck(theForm.Email.value)==false)
{
//alert( "invalid Email address");
return false;
}
return true;
}

function validateEmpty(fld) {
var error = "";

if (fld.value.length == 0) {
error = "The required field has not been filled in.\n"
}
return error;
}