img1 = new Image;
img1.src = "pix/btn_next_on.gif";
img2 = new Image;
img2.src = "pix/btn_previous_on.gif";
img3 = new Image;
img3.src = "pix/btn_top_on.gif";

function rollover(target,imgName) {
	if (document.images) {
		imgchange = 'images/' + imgName;
		document[target].src = imgchange;
		}
}

function showDefinition(def) {
	popup('def_' + def + '.asp','def',300,300);
	return false;
}

var newwin;
function popup(y,z,j,k){
	var itop=(screen.height/2)-(k/2) - 20;
	var ileft=(screen.width/2)-(j/2);
	temp = "width=" + j + ",height=" + k + ",screenX=" + ileft + ",screenY=" + itop + ",left=" + ileft + ",top=" + itop;
	temp2 = "toolbar=0,location=0,directories=0,statusbar=0,menubar=0,scrollbars=1,resizable=1,"
	newwin = window.open(y,z,temp2 + temp);
	return false;
}