function validate(){
 if(document.contact.firstname.value==""){
  alert("Please Enter Your First Name!");
  document.contact.firstname.focus();
  return false;
 }
 if(document.contact.lastname.value==""){
  alert("Please Enter Your Last Name!");
  document.contact.lastname.focus();
  return false;
 }

 
 if(document.contact.company_name.value==""){
  alert("Please Enter Your Company Name!");
  document.contact.company_name.focus();
  return false;
 }

 if(document.contact.email.value==""){
  alert("Please Enter Your E-mail ID!");
  document.contact.email.focus();
  return false;
 }
 
 
 if(document.contact.phone.value==""){
  alert("Please Enter Your Phone!");
  document.contact.phone.focus();
  return false;
 }

  if(document.contact.zip.value==""){
  alert("Please Enter Your Zip!");
  document.contact.zip.focus();
  return false;
 }

 if(document.contact.comment.value==""){
  alert("Please Enter Your Comment!");
  document.contact.comment.focus();
  return false;
 }



 
 var str=document.contact.email.value
 var filter=/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i
 if (filter.test(str)){ 
 }else{
 alert("Please input a valid email address!");
 document.contact.email.focus();
 return false;
 }

}