//toggle visibility of an obj
function toggle (targetId) {
	if (document.getElementById) {
		target = document.getElementById( targetId );
			//alert("target [" + targetId + "] : status [" + target.style.display + "]");			
			
			if (target.style.display == "none" || target.style.display == "") {
					target.style.display = "block";
					//alert("showing: " + targetId);

				} else {
					target.style.display = "none";
					//alert("hiding: " + targetId);
				}
	}
	
}