function hideDrop1() {
       document.getElementById("drop1").className = 'drop_empty';
      }  
	  function hideDrop2() {
       document.getElementById("drop2").className = 'drop_empty';
      }  
	   function hideDrop3() {
       document.getElementById("authors_1").className = 'drop_empty';
      }  
	  function hideDrop4() {
       document.getElementById("categories_1").className = 'drop_empty';
      }  
	  function hideDrop5() {
       document.getElementById("job_cat").className = 'drop_empty';
      }  
	  function hideDrop6() {
       document.getElementById("job_industry").className = 'drop_empty';
      }
	   function hideDrop7() {
       document.getElementById("job_level").className = 'drop_empty';
      }
	   function hideDrop8() {
       document.getElementById("job_type").className = 'drop_empty';
      }
	   function hideDrop9() {
       document.getElementById("job_radius").className = 'drop_empty';
      }