function styles () {
	var inputs = document.getElementsByTagName('input')
      for(var i = 0; i < inputs.length; i++) {		
	    var input = inputs.item(i);
		input.onfocus = function () {
			this.style.backgroundImage = "img/search_bg_on.jpg";
		}
		input.onblur = function () { 
			this.style.backgroundImage = "img/search_bg_off.jpg";
		}
	}

window.onload = function () {
	styles();
}