function validate() {

var frm = document.forms["cform"];

if(frm.Full_Name.value == "")
  {alert('Please enter your name.');
  frm.Full_Name.focus();
  return false;}

if(frm.Email.value == "")
  {alert('Please enter your email address.');
  frm.Email.focus();
  return false;}

var string1=frm.Email.value
if (string1.indexOf("@")==-1)
  {alert("Please input a valid email address.");
  return false;}


if(frm.Message.value == "")
  {alert('Please enter your message.');
  frm.Message.focus();
  return false;}

}