function SitewalkSearchDefault () {
  SearchInputField = document.getElementById('dnn_dnnSEARCH_txtSearch');
  SearchInputField.value = "Volltextsuche";
  SearchInputField.onfocus = SitewalkSearchSetFocus;
}

function SitewalkSearchSetFocus () {
  SearchInputField.value = '';
}

var SearchInputField;
addLoadEvent(SitewalkSearchDefault);

function addLoadEvent(func) {
	var oldonload = window.onload;
	if (typeof window.onload != 'function') {
		window.onload = func;
	} else {
		window.onload = function() {
			if (oldonload) {
				oldonload();
			}
		func();
		}

	}

}