if (document.images) {
grph1 = new Image ();
grph1.src = "blank.gif";
grph2 = new Image ();
grph2.src = "blank.gif";
grph3 = new Image ();
grph3.src = "blank.gif";

grph4 = new Image ();
grph4.src = "blank.gif";
grph5 = new Image ();
grph5.src = "blank.gif";
grph6 = new Image ();
grph6.src = "blank.gif";


grph1r = new Image ();
grph1r.src = "arrowu.gif";
grph2r = new Image ();
grph2r.src = "arrowu.gif";
grph3r = new Image ();
grph3r.src = "arrowu.gif";

grph4r = new Image ();
grph4r.src = "arrowd.gif";
grph5r = new Image ();
grph5r.src = "arrowd.gif";
grph6r = new Image ();
grph6r.src = "arrowd.gif";

}

function bOn (imgName) {
	if (document.images) {
		document [imgName].src = eval (imgName + "r.src");
		}
}
function bOff (imgName) {
	if (document.images) {
		document [imgName].src = "blank.gif";
		document [imgName].src = eval (imgName + ".src");
	}
}

function cOn (imgName) {
	if (document.images) {
		document [imgName].src = eval (imgName + "r.src");
		}
}
function cOff (imgName) {
	if (document.images) {
		document [imgName].src = "blank.gif";
		document [imgName].src = eval (imgName + ".src");
	}
}