function clear_default_input_text(element, value){
	if(element.value == value){
		element.value = "";
	}//if
}

function restore_default_input_text(element, value){
	if(element.value == ""){
		element.value = value;
	}//if
}

function open_popup_window(url, name, w, h)
{
	if (w <= 0) w = 800;
	if (h <= 0) h = 600;
	var left = (window.screen.width/2)  - (w/2);
	var top  = (window.screen.height/2) - (h/2);
	if (left < 0) left = 20;
	if (top < 0) top = 50;
       	name0 = window.open(url, name, 'width='+w+', height='+h+', directories=no, location=0, status=0, toolbar=0, scrollbars=1, leftmargin=0, menubar=0, topmargin=0, resizeable=1, screenX='+left+', screenY='+top+', left='+left+', top='+top);
        name0.focus();
}

function toggle_element(elem, show)
{
	var obj = document.getElementById(""+elem);

	if (obj == null) {
		return;
	}

	if (show) obj.style.display = "";
	else obj.style.display = "none";
}