// js_preview():
// erzeugt eine HTML-Vorschau des Inhalts eines Input-Feldes.
// time kann verwendet werden, um eine gewisse Zeit (millisekunden) zu warten, bist geupdatet wird. 

function js_preview(from_id, to_id, time){
	if(ready_for_preview(from_id, to_id)){
		var from = document.getElementById(from_id);
		
		if(time == null){
			if(document.getElementById(from_id) != null && document.getElementById(to_id) != null){
				var to = document.getElementById(to_id);
				to.innerHTML = js_change_to_html(from.value, to_id);
				// from.onblur = scroll_to_element(from);
			}
		} else {
			window.setTimeout('js_preview(\'' + from_id + '\', \'' + to_id + '\')', time);
		}
	} else {
		set_last_preview();	
	}	
}