if (document.images) {
	img("report1_up", "/images/topnav_report1_up.gif");
	img("report1_down", "/images/topnav_report1_down.gif");
	img("report2_up", "/images/topnav_report2_up.gif");
	img("report2_down", "/images/topnav_report2_down.gif");
	img("report3_up", "/images/topnav_report3_up.gif");
	img("report3_down", "/images/topnav_report3_down.gif");
	img("report4_up", "/images/topnav_report4_up.gif");
	img("report4_down", "/images/topnav_report4_down.gif");
}

function img(name, src) {
	// This function precaches an image.
	eval(name + " = new Image;");
	eval(name + ".src = '" + src + "';");
}

function rollover(name, state) {
	// This function changes the .src of the given image.
	eval("document.images." + name + ".src = " + name + "_" + state + ".src;");
}