function checkfon()

{

if(document.mailform.telefonnummer.value == "")
   {
    alert("Bitte geben Sie Ihre Telefonnummer ein!");
    document.mailform.telefonnummer.focus();
    return false;
   } 

   
   if(document.mailform.telname.value == "")
   {
    alert("Bitte geben Sie Ihren Namen an!");
    document.mailform.telname.focus();
    return false;
   } 
	
     else
   {document.mailform.submit();
   return document.mailform.submit()}
}

function P7_JumpMenu(selObj,restore){ //v1.3 by Project Seven

	var theFullString = selObj.options[selObj.selectedIndex].value;
		if (restore) selObj.selectedIndex=0;
		
	var theLength = theFullString.length;
	var endPos = theFullString.lastIndexOf("~");
	
	var theUrl, theTarget, theParent;
		if (endPos > 0) {theUrl = theFullString.substring(0,endPos);}
			else {theUrl = theFullString;}
					endPos++
					
		if (endPos < theLength) {theTarget = theFullString.substring(endPos,theLength)}
			else {theTarget = "window:Main";}
			
		if (theTarget == "window:New") {window.open(theUrl);}
			else if (theTarget == "window:Main") {eval("parent.location='"+theUrl+"'");}
				else {eval("parent.frames[\'"+theTarget+"\'].location='"+theUrl+"'");}
}

// Bild und Text auf den Übersichtsseiten wechseln
function toggleVisibility(layerName, layerName2)
		{
			var div;
			var div2;
      var browser = navigator.userAgent;
      var isMSIE = browser.indexOf("MSIE");
	
			if(div = document.getElementById(layerName))
			{
				div2 = document.getElementById(layerName2);
				if (div.style)
				{
					div = div.style;
					div2 = div2.style;
				}
				if(div.visibility == 'hidden')
				{
          if(isMSIE != -1)
          {
            // Wenn MSIE :
					  div2.display = 'none';
					  div.display = 'block';
          }
  			  div2.visibility = 'hidden';
				  div.visibility = 'visible';
				}
				else
				{
          if(isMSIE != -1)
          {
            // Wenn MSIE :
					  div.display = 'none';
					  div2.display = 'block';
          }
				  div.visibility = 'hidden';
				  div2.visibility = 'visible';
				}
			}
		}

function openWin365x450 (myWin)
{
myWin = window.open(myWin, "displayWindow", "width=365,height=450,scrollbars=yes,resizable=no,status=no,toolbar=no,menubar=no");
myWin.focus();
}

function openWin365x200 (myWin)
{
myWin = window.open(myWin, "displayWindow", "width=365,height=200,scrollbars=yes,resizable=no,status=no,toolbar=no,menubar=no");
myWin.focus();
}