function rolloverfunc(id,imgsrc) {

	var elm = document.getElementById(id);
	var imgobj = new Image();
	imgobj.onload = function() {
		switch(elm.tagName.toLowerCase()) { 
		case 'img':
			elm.src = imgobj.src;
			elm.width = imgobj.width;
			elm.height = imgobj.height;
			break;
		case 'span':
			elm.src = imgobj.src;
			elm.style.width = imgobj.width+'px';
			elm.style.height = imgobj.height+'px';
			
			var arVersion = navigator.appVersion.split("MSIE")
			var version = parseFloat(arVersion[1])
			
			if ((version >= 5.5) && (document.body.filters)) {
				elm.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src=\'" + imgobj.src + "\', sizingMethod='crop');";
			}else{
				elm.style.backgroundImage = "url("+imgobj.src+")";
			}
			
			break;
		}
	}
	
	imgobj.src = imgsrc;
}

//// name or id = "gif" ////

function chosenPNG(num_chosen) {
	rolloverfunc(num_chosen,"/img/nav/" + num_chosen + "_chosen.png");
}
function overPNG(num_over) {
    rolloverfunc(num_over, "/img/nav/" + num_over + "_over.png");
}
function outPNG(num_out) {
	rolloverfunc(num_out, "/img/nav/" + num_out + ".png");
}

//// id = "png" ////

function chosen(num_chosen){
	document.images[num_chosen].src = "/img/nav/" + num_chosen + "_chosen.gif"
}
function over(num_over){
	document.images[num_over].src = "/img/nav/" + num_over + "_over.gif"
}
function out(num_out){
	document.images[num_out].src = "/img/nav/" + num_out + ".gif"
}
function on(num_on){
	document.images[num_on].src = "/img/nav/" + num_on + "_on.gif"
}