On Click Current item
jQuery('.menuheader').click(function () {
console.log('Clicked');
jQuery('.menuheader').css('background', 'url(/expand.png) no-repeat scroll right #F5F5F5') ;
// this refers to the current clicked element, all others remain unchanged
jQuery(this).css('background', 'url(/collapse.png) no-repeat scroll right #F5F5F5') ;
});