fr_n = new Image();
fr_n.src = "stylesheets/images/control_fr_n.png";   /* erste Standard-Grafik */
fr_h = new Image();
fr_h.src = "stylesheets/images/control_fr_h.png"; 	/* erste Highlight-Grafik */
sr_n = new Image();
sr_n.src = "stylesheets/images/control_sr_n.png";   /* erste Standard-Grafik */
sr_h = new Image();
sr_h.src = "stylesheets/images/control_sr_h.png"; 	/* erste Highlight-Grafik */
 p_n = new Image();
 p_n.src = "stylesheets/images/control_p_n.png";   /* erste Standard-Grafik */
 p_h = new Image();
 p_h.src = "stylesheets/images/control_p_h.png"; 	/* erste Highlight-Grafik */
 c_n = new Image();
 c_n.src = "stylesheets/images/control_c_n.png";   /* erste Standard-Grafik */
 c_h = new Image();
 c_h.src = "stylesheets/images/control_c_h.png"; 	/* erste Highlight-Grafik */
 n_n = new Image();
 n_n.src = "stylesheets/images/control_n_n.png";   /* erste Standard-Grafik */
 n_h = new Image();
 n_h.src = "stylesheets/images/control_n_h.png"; 	/* erste Highlight-Grafik */
sf_n = new Image();
sf_n.src = "stylesheets/images/control_sf_n.png";   /* erste Standard-Grafik */
sf_h = new Image();
sf_h.src = "stylesheets/images/control_sf_h.png"; 	/* erste Highlight-Grafik */
ff_n = new Image();
ff_n.src = "stylesheets/images/control_ff_n.png";   /* erste Standard-Grafik */
ff_h = new Image();
ff_h.src = "stylesheets/images/control_ff_h.png"; 	/* erste Highlight-Grafik */

function rollover (name, object) {
  window.document.getElementById(name).src = object.src;
}

function Go (select) {
  var wert = select.options[select.options.selectedIndex].value;
      window.document.location.href = wert;
}

function chkSearch () {
	if(document.SearchForm.needle.value == ""){
		alert("Bitte geben Sie ein Suchbegriff ein.");
		return false;
	}
	if((document.SearchForm.optionKeywords.checked == false)){
		if((document.SearchForm.optionDescription.checked == false)){
			if((document.SearchForm.optionFullText.checked == false)){
				alert("Sie müssen mindestens ein Suchgebiet angeben.");
				return false;
			}
		}
	}
}