var ns4 = document.layers;
	var op5 = (navigator.userAgent.indexOf("Opera 5")!=-1)
		||(navigator.userAgent.indexOf("Opera/5")!=-1);
	var op6 = (navigator.userAgent.indexOf("Opera 6")!=-1)
		||(navigator.userAgent.indexOf("Opera/6")!=-1);
	var agt=navigator.userAgent.toLowerCase();
	var mac = (agt.indexOf("mac")!=-1);
	var ie = (agt.indexOf("msie") != -1);
	var mac_ie = mac && ie;
	
	var firstFocus=true;

function rollover(imgg,change) {
    var newImage;
    if (change) newImage="gfx/"+imgg+"_active.png";
    else newImage="gfx/"+imgg+".png";
    document.images[imgg].src=newImage;
}
function showhide(id) {
	if (document.getElementById(id).style.display=='none') {document.getElementById(id).style.display='block';}
	else {document.getElementById(id).style.display='none';}
}
function clearForm(obj) {
    if (firstFocus) {obj.value='';
    firstFocus=false;}
}

function getObjNN4(obj,name)
{
	var x = obj.layers;
	var foundLayer;
	for (var i=0;i<x.length;i++)
	{
		if (x[i].id == name)
		 	foundLayer = x[i];
		else if (x[i].layers.length)
			var tmp = getObjNN4(x[i],name);
		if (tmp) foundLayer = tmp;
	}
	return foundLayer;
}

function findPos(obj) {
	var curleft = curtop = 0;
	if (obj.offsetParent) {
		curleft = obj.offsetLeft
		curtop = obj.offsetTop
		while (obj = obj.offsetParent) {
			curleft += obj.offsetLeft
			curtop += obj.offsetTop
		}
	}
	return [curleft,curtop];
}
function getElementWidth(Elem) {
	if (ns4) {
		var elem = getObjNN4(document, Elem);
		return elem.clip.width;
	} else {
		if(document.getElementById) {
			var elem = document.getElementById(Elem);
		} else if (document.all){
			var elem = document.all[Elem];
		}
		if (op5) {
			xPos = elem.style.pixelWidth;
		} else {
			xPos = elem.offsetWidth;
		}
		return xPos;
	}
}

function showSubMenu(id) {
    var i=1;
    while (document.getElementById('menu'+i)) {
        if (document.getElementById('menu'+i+'-sub')) document.getElementById('menu'+i+'-sub').style.display='none';
        i++;
    }
    if (document.getElementById(id+'-sub')) {
    var elem=document.getElementById(id+'-sub').style;
    var pos=findPos(document.getElementById(id));
    elem.top=pos[1]+40+'px';
    elem.left=pos[0]+'px';
    elem.display='block';
    var width=getElementWidth(id)+2+'px';
    if (ie) document.getElementById(id+'-sub').getElementsByTagName('table')[0].style.width='auto';
    elem.minWidth=width;
    }
}
function hideSubMenu(id) {
    document.getElementById(id).style.display='none';
}
function showPhoto(img, name) {
	var str="<div><img id='photo' src='"+img+"' alt='"+name+"' /><div id='photoopis' class='photoopis'>"+name+"</div></div>";
	document.getElementById('preview').innerHTML=str;
	document.getElementById('photoopis').style.width=document.getElementById('photo').width;
	showhide('preview');
	
}