Mouse Out Delay Error To Hide The UL

I am using a 'suckertree horizontal menu'. I am trying to alter the javascript to provide a delay with ouseout (to hide the UL). I am having issues!

Here is the original code:
ultags[t].parentNode.onmouseout=function(){
this.getElementsByTagName("ul")[0].style.visibility="hidden"
}

Here is the code I am working with:

ultags[t].parentNode.onmouseout=function(){
setTimeout("this.getElementsByTagName("" + ul + "")[0].style.visibility="" + hidden + """, 1500);
}