var nn4=(document.layers)? true:false;
var nn6=(document.getElementById)? true:false;
var ie4=(document.all)? true:false;
var ie5=false;
if(ie4){
if((navigator.userAgent.indexOf('MSIE 5')> 0)||(navigator.userAgent.indexOf('MSIE 6')> 0)||window.opera){ 
ie5=true; 
} 
if(nn6){
nn6=false;
}
}

	function hide(ident) {
		if(nn4) {
			document.layers[ident].visibility = "hide";
		} else if(ie4) {
			document.all[ident].style.visibility = "hidden";
		} else if(nn6) {
			document.getElementById(ident).style.visibility = "hidden";
		}
	}
function show(ident) {
		if(nn4) {
			document.layers[ident].visibility = "show";
		} else if(ie4) {
			document.all[ident].style.visibility = "visible";
		} else if(nn6) {
			document.getElementById(ident).style.visibility = "visible";
		}
	}

   var szerokoscokna=500
   var wysokoscokna=400
   var odstepwysokosc=(screen.height-wysokoscokna)/3
   var odstepszerokosc=(screen.width-szerokoscokna)/2
   
document.write("<style>");
document.write("<!--");
document.write("#layer1 {position:absolute; z-index:8; width: 100%; height:1250px; top:0; left:0; visibility:hidden; background:url(tlo_form.png); border: 0 none;} ");
document.write("#layer12 {position:absolute; z-index:9; width: "+szerokoscokna+"; height: "+wysokoscokna+"; top:"+odstepwysokosc+"; left:"+odstepszerokosc+"; visibility:visible; } ");
document.write("-->");
document.write("</style>");