$(document).ready(function(){
	$('#navi_designer, #navi_projekte, #navi_impressum').hover(function(){
		isactive = true;
		if(($(this).attr('src')).search(/_hi\./) == -1) {
			src = ($(this).attr('src')).replace(/\./, "_hi.");
			$(this).attr('src', src);		
			isactive = false;
		}
	},function(){
		if(!isactive) {
			src = ($(this).attr('src')).replace(/_hi/, "");
			$(this).attr('src', src);
		}
	})
});