function toggle(selection) {
	var nextTR = selection.parentNode.nextSibling;
	var previousTD = selection.previousSibling;
	while(previousTD.tagName != "TD") previousTD = previousTD.previousSibling;
	var thisImg = selection.firstChild;
	while(thisImg.tagName != "IMG") thisImg = thisImg.nextSibling;
	while(nextTR.tagName != "TR") nextTR = nextTR.nextSibling;
	var nextTD = nextTR.firstChild;
	while(nextTD.tagName != "TD") nextTD = nextTD.nextSibling;
	if(nextTD.className == "hideDesc"){
		nextTD.className = "showDesc";
		previousTD.className = "qLink selected";
		thisImg.src="/graphics/info_buttonDown.gif";
	}else{
		nextTD.className = "hideDesc";
		previousTD.className = "qLink";
		thisImg.src="/graphics/info_button.jpg";
	}
}