var angezeigt = false;

function verstecken(span) { 
	if (angezeigt) {
		document.getElementById(span).style.display = 'none';
		angezeigt = false;
	} else {
		document.getElementById(span).style.display = 'block';
		angezeigt = true;
	}
} 

function Testen () {
	nodeSELECT = document.getElementsByTagName("select");
	
	for (var k=0; k < nodeSELECT.length; k++) {
	       	var idSELECT = nodeSELECT[k].getAttribute("id");		
		var selectObj = document.getElementById (idSELECT);		
            	selectObj.options[0].disabled = true;
	}
}