function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v3.0
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

// Switch fuer css
function setActiveStyleSheet(title) { 
  var i, a, main; 
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) { 
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) { 
      a.disabled = true; 
      if(a.getAttribute("title") == title) a.disabled = false; 
    } 
  } 
} 

function getActiveStyleSheet() { 
  var i, a; 
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) { 
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && !a.disabled) return a.getAttribute("title"); 
  } 
  return null; 
} 

function getPreferredStyleSheet() { 
  var i, a; 
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) { 
    if(a.getAttribute("rel").indexOf("style") != -1 
       && a.getAttribute("rel").indexOf("alt") == -1 
       && a.getAttribute("title") 
       ) return a.getAttribute("title"); 
  } 
  return null; 
} 

function createCookie(name,value,days) { 
  if (days) { 
    var date = new Date(); 
    date.setTime(date.getTime()+(days*24*60*60*1000)); 
    var expires = "; expires="+date.toGMTString(); 
  } 
  else expires = ""; 
  document.cookie = name+"="+value+expires+"; path=/"; 
} 

function readCookie(name) { 
  var nameEQ = name + "="; 
  var ca = document.cookie.split(';'); 
  for(var i=0;i < ca.length;i++) { 
    var c = ca[i]; 
    while (c.charAt(0)==' ') c = c.substring(1,c.length); 
    if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length); 
  } 
  return null; 
} 

window.onload = function(e) { 
  var cookie = readCookie("style"); 
  var title = cookie ? cookie : getPreferredStyleSheet(); 
  setActiveStyleSheet(title);
MM_preloadImages('buttons/home_neg.jpg','buttons/menschen_neg.jpg','buttons/krankheiten_neg.jpg','buttons/forschung_neg.jpg','buttons/gesundheit_neg.jpg','buttons/materialien_neg.jpg','buttons/impressum_neg.jpg','buttons/impressum_neg.jpg','buttons/impressum_neg.jpg','buttons/alterskrankheiten_neg.jpg','buttons/entzuendungen_neg.jpg','buttons/krebs_neg.jpg','buttons/kontrollproben_neg.jpg','buttons/nervensystem_neg.jpg','buttons/genomforschung_neg.jpg','buttons/kontakt_neg.jpg','buttons/service_neg.jpg','buttons/studienmuster_neg.jpg','buttons/downloads_neg.jpg','buttons/linkliste_neg.jpg','buttons/presse_neg.jpg')
} 

window.onunload = function(e) { 
  var title = getActiveStyleSheet(); 
  createCookie("style", title, 365); 
} 

var cookie = readCookie("style"); 
var title = cookie ? cookie : getPreferredStyleSheet(); 
setActiveStyleSheet(title);