function DoExpandCollapse(identifier) {
	var divTag = document.getElementById("div" + identifier);
	var imgTag = document.getElementById("img" + identifier);
	if (divTag.style.display=="none") {
		divTag.style.display="block";
  	imgTag.src="images/minus.gif";
	}
	else {
		divTag.style.display="none";
  	imgTag.src="images/plus.gif";
	}
}