// init
var search_field;
window.onload = function()
{
	search_field = document.getElementById('search-text');
	search_blur();
}

function search_focus()
{
	// hide background
	search_field.style["backgroundPosition"] = "0px 20px";
}

function search_blur()
{
	// search field is empty
	if(search_field.value == "")
	{ // -> show background
		search_field.style["backgroundPosition"] = "0px 0px";
	}
}