Unable to reflect javascript changes in jsp

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Javascript

JSP

function hello(obj){
var childs = document.getElementById(obj).parentNode.getElementsByTagName("ul");
for( var i=0; i< childs.length; i++ )
{
var test=document.getElementById(childs[i].id);
test.style.display != "block" ? test.style.display = "block" : test.style.display = "none";
}
}





changes in the style display are not applying in the jsp file.
the above code is changing style but jsp is not reflecting these changes.why?????