function loadIframe(iframeName, url) {
	url = url + "?ms=" + new Date().getTime();
  	if ( window.frames[iframeName] ) {
    	window.frames[iframeName].location = url;   
    	return false;
 	}
  	else return true;
}

function changeHeader(imgName) {
	var img = "<img src=\"images/" + imgName + "\">";
	document.getElementById("header").innerHTML = img;
}