function fold_category(id) {
	var target = document.getElementById(id).style;
	if(target.display == "none") {
		target.display = "block";
	} else {
		target.display = "none";
	}
	return false;
}

function swap_image(id, img1, img2) {
	var target = document.getElementById(id);
	if(target.src == img1) {
		target.src = img2;
	} else if(target.src == img2) {
		target.src = img1;
	}
	return ;
}

function Change_Pic(name,newh){
	if(document.images["large_image"].src != document.images[name].src) {
		if(newh != undefined) {
			document.images["large_image"].src = document.images[name].src;
			document.images["large_image"].height = newh;
		} else {
			var largeX = document.images["large_image"].width;
			var smallX = document.images[name].width;
			var smallY = document.images[name].height;
			document.images["large_image"].src = document.images[name].src;
			document.images["large_image"].height = Math.round(smallY * largeX / smallX);
		}
	}
}