window.onload = 
function MenuHead(){
  if (document.all && document.getElementById) {
  	menuHead = document.getElementById("menu");
    for (i=0; i < menuHead.childNodes.length; i++) {
      menuItems = menuHead.childNodes[i];
      if (menuItems.nodeName == "LI") {
        menuItems.onmouseover = 
	        function overItems(){
	          this.className += " over";
	          ShowHideSelect('hidden')
		      }
        menuItems.onmouseout = 
        	function outItems(){
	          this.className = this.className.replace(" over", "");
	          ShowHideSelect('visible')
        	}
      }
    }
    
    if (document.getElementById("menu2")) {
    	menuHead = document.getElementById("menu2");
      for (i=0; i < menuHead.childNodes.length; i++) {
        menuItems = menuHead.childNodes[i];
        if (menuItems.nodeName == "LI") {
          menuItems.onmouseover = 
  	        function overItems(){
  	          this.className += " over";
  	          ShowHideSelect('hidden')
  		      }
          menuItems.onmouseout = 
          	function outItems(){
  	          this.className = this.className.replace(" over", "");
  	          ShowHideSelect('visible')
          	}
        }
      }
    }
  }
}


//skryje a zobrazi SELECT
function ShowHideSelect(vis){
	sel = document.getElementsByTagName('select');
	for(i = 0; i < sel.length; i++){
    sel[i].style.visibility = vis;
  }
}