function classChange(elementID) {

	var icon = document.getElementById("cnt_icon_" + elementID);
	var divClass = document.getElementsByTagName("div");

	for (i=0;i<divClass.length; i++) {
		if (divClass.item(i).className == "subcontent" + elementID){
			if (divClass.item(i).style.display == "block"){
				divClass.item(i).style.display = "none";
				icon.src = "images2/icon_plus.gif";
			}
			else if (divClass.item(i).style.display == "none"){
				divClass.item(i).style.display = "block";
				icon.src = "images2/icon_minus.gif";
			}
		}
	}
}