function checkParent( src, tagName ) {
while ( src != null ) {
if (src.tagName == tagName) 
return src;
src = src.parentElement;
}
return null;
}
function checkContent( src, tagName ) {
var pos = src.sourceIndex ;
while ( src.contains( document.all[++pos] ) )
if ( document.all[pos].tagName == tagName )
return document.all[pos] ;
return null ;
} 
// onClick event
function outlineAction() { 
var src = event.srcElement ;
var item = checkParent( src, "LI" ) ;

if ( parent != null ) {
var content = checkContent( item, "UL" ) ;

if ( content != null )
if ( content.style.display == "" )
content.style.display = "block" ;
else
content.style.display = "" ;
}
event.cancelBubble = true;
}