function changeClass(obj, new_class) {
    obj.className = new_class;
}

function changeBgColor(obj, new_color) {
	obj.style.backgroundColor=new_color;
}

function changePic(name, pic) {
	name.src = pic;
}

function popup(url, name, width, height) {
	left_pos = (screen.width / 2) - (width / 2);
	top_pos  = (screen.height / 2) - (height / 2);
	window.open(url, name, 'width=' + width + ', height=' + height + ', left=' + left_pos + ', top=' + top_pos+', resizable=1, scrollbars=1');	
}

function externalLinks() {
	if (!document.getElementsByTagName) return;
	var anchors = document.getElementsByTagName("a");
	for (var i=0; i<anchors.length; i++) {
		var anchor = anchors[i];
		if (anchor.getAttribute("href") && anchor.getAttribute("rel") == "external")
			anchor.target = "_blank";
	}
}

function popup1 (url) {
	var sizeX = 520;
	var sizeY = 540;
	window.open(url, 'NovoOkno', 'resizable=yes,scrollbars=no, width='+sizeX+', height='+sizeY+', screenX=0, screenY=0, top=0, left=0');
	return false;
}

function onLoadFunction() {
	externalLinks();
}
window.onload = onLoadFunction;