function validateForm()
 {
            if (document.gt_form.txt_Name.value == "")
            {
            alert("Name is a required field.");
            document.gt_form.txt_Name.focus();
			return false;
            }
   
            if ( document.gt_form.txt_City.value == "")
            {
            alert("City is a required field.");
            document.gt_form.txt_City.focus();
            return false;
            }
			if ( document.gt_form.txt_Mobile.value == "")
            {
            alert("Contact Number is a required field.");
            document.gt_form.txt_Mobile.focus();
            return false;
            }
			if ( document.gt_form.txt_Email.value == "")
            {
            alert("Email is a required field.");
            document.gt_form.txt_Email.focus();
            return false;
            }
			if ( document.gt_form.txt_Query.value == "")
            {
            alert("Query is a required field.");
            document.gt_form.txt_Query.focus();
            return false;
            }
if ( document.gt_form.txt_Email.value != "" )
{
var re =/^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/

        if (!document.gt_form.txt_Email.value.match(re))
        {
        alert('Your email address is not in a valid format.\n Some valid formats are:\nsomeone@somewhere.com\nsome_one@some.where.net')
        document.gt_form.txt_Email.focus();	
        return false;
        }
}

}