function hide(myid) {
	
		var obj = document.getElementById(myid); 
		if (obj) {
			obj.style.visibility = "hidden";
			obj.style.display = "none";
		} else {
			alert("Hide error: '" + myid + "' does not exist")
		}
}
function show(myid) {

		var obj = document.getElementById(myid); 
		if (obj) {
		 obj.style.visibility = "visible";
		 obj.style.display = "block";
		} else {
			alert("Show error: '" + myid + "' does not exist")
		}
}