function check_value(){
if(trim(document.frm.name.value)==0){
         alert ("Please Enter your name");
         document.frm.name.focus();
         return;
     }
if(trim(document.frm.email.value)==0){
         alert ("please enter you email");
         document.frm.email.focus();
         return;
     } 
 if(trim(document.frm.phone.value).length==0){
         alert ("Please Enter your Phone number");
         document.frm.phone.focus();
         return;
     }
 if(trim(document.frm.message.value).length==0){
         alert ("Enter your message");
         document.frm.message.focus();
         return;
     }  
    document.frm.submit();
 }
 
function trim(input)
{
  var lre = /^\s*/;
  var rre = /\s*$/;
  input = input.replace(lre, "");
  input = input.replace(rre, "");
  return input;
}