var last_preview = 0;
var min_till_preview = 1500;
var lp_timeout = null;

function ready_for_preview(from_id, to_id){
	var d = new Date();
	var time = d.getTime();

	// alert(last_preview + ", " +time);
	
	if(time > (last_preview + min_till_preview)){
		if(lp_timeout != null){
			window.clearTimeout(lp_timeout);
		}
		return true;
	} else {
		window.clearTimeout(lp_timeout);
		lp_timeout = window.setTimeout('js_preview(\'' + from_id + '\', \'' + to_id + '\');', (min_till_preview * 1.25));
		return false;
	}
}