function clipTo(obj,t,r,b,l) {
	if (navigator.appName == "Netscape") {
		obj.clip.top = t
		obj.clip.right = r
		obj.clip.bottom = b
		obj.clip.left = l
	}
	else obj.clip = "rect("+t+"px "+r+"px "+b+"px "+l+"px)"
}

function clipValues(obj,which) {
	if (navigator.appName == "Netscape") {
		if (which=="t") return obj.clip.top
		if (which=="r") return obj.clip.right
		if (which=="b") return obj.clip.bottom
		if (which=="l") return obj.clip.left
	}
	else{
		var clipv = obj.clip.split("rect(")[1].split(")")[0].split("px")
		if (which=="t") return Number(clipv[0])
		if (which=="r") return Number(clipv[1])
		if (which=="b") return Number(clipv[2])
		if (which=="l") return Number(clipv[3])
	}
}