var target = "blank"; 



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, 'select'); 
} 
else if(target != ""){ 
eval('parent.' + target + '.location.href = url'); 
} 
else{ 
location.href = url; 
} 

} 

}