function menuOn(id) { // m_obrazek.jpg => m_obrazek_h.jpg
	var src = document.getElementById(id).src;
	srcSplit = src.split("/");
	var folder = "";
	for(i=0; i < srcSplit.length-1; i++) {
		folder += srcSplit[i]+"/";		
	}
	document.getElementById(id).src = folder+"m_"+id+"_h.jpg";
}

function menuOut(id) {
	var src = document.getElementById(id).src;
	srcSplit = src.split("/");
	var folder = "";
	for(i=0; i < srcSplit.length-1; i++) {
		folder += srcSplit[i]+"/";		
	}
	document.getElementById(id).src = folder+"m_"+id+".jpg";
}

function viewOrig(src, w, h) {
	w = (w+20);
	h = (h+20);
	left = (screen.availWidth-w)/2;
	shora = (screen.availHeight-h)/2;
	window.open(src,"popup","left="+left+",top="+shora+",scrollbars=yes,resizable=no,toolbar=no,menubar=no,status=no,location=0,width="+w+",height="+h);
	}