var	sNavOn = new Array(8);
	var	sNavOff = new Array(8);
	var	tBody = new Array(8);
	var	x;
	// var z;
	var b;
	var	sklit = -1;
	var	skimglit = "";
	var	skallloaded = false;
// preload images
//	if (document.images) {
		for (x = 1; x <9; x++) {
			sNavOn[x] = new Image();
			sNavOff[x] = new Image();
			 z=x-1;
			sNavOn[x].src = "http://orthoinfo.aaos.org/images/yocskelimage"+z+"ov.gif";
			sNavOff[x].src = "http://orthoinfo.aaos.org/images/yocskelimage"+z+".gif";
		}
		for (b = 1; b < 9; b++) {
			tBody[b] = new Image();
			tBody[b].src = "http://orthoinfo.aaos.org/images/yocskelarm___elbow"+b+".gif";
		}
		skallloaded = true;
//	}
// highlight button 
	function skel_act(imgName,x) {
		if (skallloaded) {
			document [imgName].src = sNavOn[x].src;
			sklit = x;
			skimglit = imgName;
		}
	}

	function bpname(partindex) {
		if (skallloaded) {
			document.bodypart.src = tBody[partindex].src;
		}
	}

// un-highlight button
	function skel_inact() {
		if (skallloaded) {
			if (sklit != -1){
				document [skimglit].src = sNavOff[sklit].src;
				document.bodypart.src = "http://orthoinfo.aaos.org/images/yocskelarm___elbow.gif";
				sklit = -1;
			}
		}
	}
// submit skeleton form
	function FormSubmit(bpi) {
		document.skeleton.focus.selectedIndex=bpi;
		document.skeleton.submit();
	}