function contact_chk(){

 if(document.contact.First_name.value==''){
	 alert('First_name none!!!');
	 document.contact.First_name.focus();
	 return false;
   }
	
 if(document.contact.Last_name.value==''){
	 alert('Last_name none!!!');
	 document.contact.Last_name.focus();
	 return false;
   }
   
   for(var i=0;i<document.contact.sex.length;i++){
      if (document.contact.sex[i].checked){
	      var pass=true;
	    }
	     }
	if(!pass){
	alert("what's ur Title!!!");
	document.contact.sex[0].focus();
	return false;
	}
	
	if((document.contact.E_mail.value=='')){
		alert("E-MAIL none！！");
		document.contact.E_mail.focus();
		return false;
			}
	
	if(!document.contact.E_mail.value==''){		
		if(document.contact.E_mail.value.search(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/) == -1)
		 {
		  alert("wrong type for email!!");
		  document.contact.E_mail.focus();
		   return false;
			}
	}
	
	if(document.contact.Campany.value==''){
	 alert('Campany none!!!');
	 document.contact.Campany.focus();
	 return false;
   }
   
   if(document.contact.country.selectedIndex==0){
			document.contact.country.focus();
            alert("Please choose ur country");
		     return false;
         }
   
  /* if(document.contact.Address.value==''){
	 alert('Address none!!!');
	 document.contact.Address.focus();
	 return false;
   }*/
   
   if(document.contact.Tel.value==''){
	 alert('Tel none!!!');
	 document.contact.Tel.focus();
	 return false;
   }
   if(document.contact.Message.value==''){
	  document.contact.Message.focus();
      alert("Message none!!!");
	  return false;
     }
  
   if(document.contact.checknum.value==''){
	  document.contact.checknum.focus();
      alert("Code none!!!");
	  return false;
     }
}