function getStyle( layer ) {
         if( document.getElementById ) {
                 return document.getElementById( layer ).style
         } else if( document.all ) {
                 return document.all[layer].style
         } else {
                 return document[layer]
         }
}

function hide(id) {getStyle(id).visibility='hidden'}
function show(id) {getStyle(id).visibility='visible'}

function zindex(id,uroven) {
    alert('>>'+getStyle(id).visibility + '<<');
    getStyle(id).zindex='50';
}