function showHiddenElem(id) {
	if(!document.getElementById(id)) {
		return false;
	}
	elem = document.getElementById(id);
	if(elem.style.display == 'block') elem.style.display = 'none';
	else elem.style.display = 'block';
}

function getElem(id) {
	return document.getElementById(id);
}




function showControlPanel()
{
	showHiddenElem('control_panel');
	var panel = getElem('control_panel');
	panel.style.width = 0+"px";
	var interval = setInterval( function() {
		panel.style.width = (parseInt(panel.style.width)+50) + "px";
		if (parseInt(panel.style.width)>299) clearInterval(interval);
	},1);
}