First let's try:

#####THE JAVASCRIPT CHECK

function check() {
   okSoFar = true;
   check1 = document.insertlocation.lid.value;
if (check1 == "") 
{alert("You need to enter some values to submit.");
okSoFar=false;
}
 //-- If all fields OK go ahead and submit the form and put up a message.
  if (okSoFar==true) {
 document.insertlocation.submit();
  }
}

Keep me posted.