function loadXMLDoc(dname){
	if (window.XMLHttpRequest){
		xhttp=new XMLHttpRequest();
	}
	else{
		xhttp=new ActiveXObject("Microsoft.XMLHTTP");
	}
	xhttp.open("GET",dname,false);
	xhttp.send("");
	return xhttp.responseXML;
} 

function get_nextSibling(n){
	y=n.nextSibling;
	while (y.nodeType!=1){
		y=y.nextSibling;
	}
	return y;
}

function get_firstChild(n){
	y=n.firstChild;
	while (y.nodeType!=1){
		y=y.nextSibling;
	}
	return y;
}

function mouseOver(txt){
document.getElementById(txt).src ="images/button/down_"+txt+".png";
}
function mouseOut(txt){
document.getElementById(txt).src ="images/button/up_"+txt+".png";
}