listbox disabled onload event

  
        var sel_index = document.t_asuntoSearch.s_id_sector.options[document.t_asuntoSearch.s_id_sector.selectedIndex].value;  
        if (sel_index == "") {  
                //Clear child listbox  
                        for(var i=document.t_asuntoSearch.s_id_empresa.length;i>0;i--) {  
                        document.t_asuntoSearch.s_id_empresa.options = null;  
                }   
                document.t_asuntoSearch.s_id_empresa.options[0] = new Option("Seleccionar un Sector","");  
                document.t_asuntoSearch.s_id_empresa.disabled = true;  
        }  

  
	Select Case Session("Area")  
		Case 7  
			t_asuntoSearch.s_id_empresa.DataSource.Where = " id_sector = 2"   
		Case 11  
			t_asuntoSearch.s_id_empresa.DataSource.Where = " id_empresa = 6 or id_empresa = 4 or id_empresa = 11 or id_empresa = 5" 	  
		Case Else  
			t_asuntoSearch.s_id_empresa.DataSource.Where  
	End Select  

window.onload=startList;

  
window.onload=startList;  

  
function WindowOnload(f) {  
    var prev=window.onload;  
    window.onload=function(){ if(prev)prev(); f(); }  
  }  
WindowOnload(startList)