function prepareSearch(){
	if(! document.getElementById) return false;
	if(! document.getElementById('search_field')) return false;
	var element = document.getElementById('search_field');
	element.onfocus = function() {
		if (this.value == this.defaultValue) {
			this.value = "";
		}
	}
	element.onblur = function() {
		if (this.value == "") {
			this.value = this.defaultValue;
		}
	}
}
function addLoadEvent(func) {
	var oldonload = window.onload;
	if (typeof window.onload != 'function') {
		window.onload = func;
	} else {
		window.onload = function() {
			oldonload();
			func();
		}
	}
}
addLoadEvent(prepareSearch);