function isValidEmail(str) {
   return (str.indexOf(".") > 2) && (str.indexOf("@") > 0);

}



function contact_validation()
{ 
  var status=true;

  document.contact.name.style.backgroundColor="#FFFFFF";
  document.contact.email.style.backgroundColor="#FFFFFF";
  document.contact.subject.style.backgroundColor="#FFFFFF";
  document.contact.comments.style.backgroundColor="#FFFFFF";



    if (document.contact.name.value==''){
            document.contact.name.style.backgroundColor="#FFFF99";
            status=false;
    }
    if (document.contact.email.value==''){
            document.contact.email.style.backgroundColor="#FFFF99";
            status=false;
    }
    if (document.contact.subject.value==''){
            document.contact.subject.style.backgroundColor="#FFFF99";
            status=false;
    }
    if (!isValidEmail(document.contact.email.value)){
            document.contact.email.style.backgroundColor="#FFFF99";
            status=false;
    }
    if (document.contact.comments.value==''){
            document.contact.comments.style.backgroundColor="#FFFF99";
            status=false;
    }
    return status;

}