I have java-script menu that is getting behind openlayers OSM layer (only after it loads). I've tried giving z-index:9999 to the menu div but it didn't work. Any idea ?
I opened the example and found that your menu div id=ctl00__MenuV_MultiLevelMenun0Items has a fixed z-index = 1.
Update it to a value like 1100 so it will be on top of other things. Your menu code is pushing z-index back to 1. Fix this.