function preload(lst)
{
	var dummy=new Image();
	for(var i=0; i<lst.length; i++)
	{
		dummy.src=lst[i];
	}
}

function switch_el(show, hide, vis_el, backgr)
{
	document.getElementById(vis_el).style.background="url("+backgr+")";
	document.getElementById(show).style.display="block";
	document.getElementById(hide).style.display="none";
}

function pad(num)
{
  return num>9?num:'0'+num;
}

var search_bar_cleared = false;
function clearSearchBar(el)
{
	if(search_bar_cleared === false) { el.value = ''; search_bar_cleared = true; };
}