var menuids=["menu"] //Enter id(s) of UL menus, separated by commas
  
  function buildsubmenus() {
    for (var i=0; i<menuids.length; i++) {
      var ultags=document.getElementById(menuids[i]).getElementsByTagName("ul")
      for (var t=0; t<ultags.length; t++) {
        if (ultags[t].parentNode.parentNode.id==menuids[i]) //if this is a first level submenu
          ultags[t].style.left=(ultags[t].parentNode.offsetWidth + 1) +"px" //dynamically position first level submenus to be width of main menu item
        else //else if this is a sub level submenu (ul)
          ultags[t].style.left=(ultags[t-1].getElementsByTagName("a")[0].offsetWidth + 3)+"px" //position menu to the right of menu item that activated it
          // ultags[t].style.left=ultags[t].parentNode.offsetWidth+"px"
        ultags[t].parentNode.onmouseover=function() {
          this.getElementsByTagName("ul")[0].style.display="block"
        }
        ultags[t].parentNode.onmouseout=function() {
          this.getElementsByTagName("ul")[0].style.display="none"
        }
      }
      for (var t=ultags.length-1; t>-1; t--) { //loop through all sub menus again, and use "display:none" to hide menus (to prevent possible page scrollbars
        ultags[t].style.visibility="visible"
        ultags[t].style.display="none"
      }
    }
  }
  
  if (window.addEventListener)
    window.addEventListener("load", buildsubmenus, false)
  else if (window.attachEvent)
    window.attachEvent("onload", buildsubmenus)