 <!-- 
 var target = "top"; 
 function jump(){ 

 var url = document.form1.select.options[document.form1.select.selectedIndex].value; 

 if(url != "" ){ 

 if(target == 'top'){ 
 top.location.href = url; 
 } 
 else if(target == 'blank'){ 
 window.open(url, 'window_name'); 
 } 
 else if(target != ""){ 
 eval('parent.' + target + '.location.href = url'); 
 } 
 else{ 
 location.href = url; 
 } 

 } 

 }  

 // -->