/* Simon Brüchner 2006 */
function toggle() {
	var signPlus  = '     ';
	var signMinus = '    ';
	if (document.getElementById('wklink').innerHTML == signPlus) {	
	    void(document.getElementById('wklink').style.backgroundImage = 'url(./img/wk_gross.gif)');
		void(document.getElementById('wklink').innerHTML = signMinus); 
		void(document.getElementById('wk2').style.display = 'none');  
		void(document.getElementById('wk').style.display = 'inline');
	} else {
		void(document.getElementById('wklink').style.backgroundImage = 'url(./img/wk_klein.gif)');
		void(document.getElementById('wklink').innerHTML = signPlus); 
		void(document.getElementById('wk').style.display = 'none');
		void(document.getElementById('wk2').style.display = 'inline');  
	}
}