function validate_form() {
 if (!check_empty(document.search.ProductName.value)){
	   alert('Enter Rx Name, Please!');
	   document.search.ProductName.focus();	
	   return false;   
  }
 if (document.search.ProductName.value =='%'){
	   alert('No Rx Name as %, Re-enter Please!');
	   document.search.ProductName.focus();	
	   return false;   
  }
  return true;
}

function check_empty(text) {
  return (text.length > 0); // returns false if empty
}