glnavn="";
function skjulmenu(){if (glnavn!=""){document.getElementById(glnavn).style.visibility="hidden"}}
function visumenu(navn){
  skjulmenu();
  document.getElementById(navn).style.visibility="visible";document.getElementById(navn).focus();
  glnavn=navn;   
}
function vis(navn){navn.style.visibility="visible"}

vindue='';
function onw(ref,w,h,f){
if (vindue!='') nw.close();
nw=window.open(ref,'nw','width='+w+',height='+h+',left=0,top=0,'+f+',resizable=yes');
vindue='ok';
return false
}

var vindue1;
function onw1(ref,w,h,f){
if (!vindue1 || vindue1.closed) {vindue1=window.open(ref,'nw1','width='+w+',height='+h+',left=135,top=200,'+f+',resizable=yes');}
else {vindue1.focus();}
}

var vindue2;
function onw2(ref,w,h,f){
if (!vindue2 || vindue2.closed) {vindue2=window.open(ref,'nw2','width='+w+',height='+h+',left=135,top=200,'+f+',resizable=yes');}
else {vindue2.focus();}
}


function gsearch(finne){
soeg="http://www.google.dk/search?q="+encodeURIComponent(finne);
onw(soeg,800,600,'scrollbars=yes,toolbar=yes,menubar=yes,location=yes');
}

function onif(ref,w,h){
document.all.krop.outerHTML="<div id='krop' class='k' onMouseOver='skjulmenu()'><iframe src='"+ref+"' width='"+w+"' height='"+h+"' frameborder='no'  scrolling='no' id='ramme' style='position:relative;left:135px;top:5px'></iframe></div>"
}

function onif2(ref,w,h){
document.all.krop.outerHTML="<div id='krop' class='k' onMouseOver='skjulmenu()'><iframe src='"+ref+"' width='"+w+"' height='"+h+"' frameborder='no'  scrolling='yes' id='ramme' style='position:relative;left:135px;top:5px'></iframe></div>"
}

function checkBrowser(){
usag=navigator.userAgent;
if (usag.indexOf("Win")!=-1) {osSYS="<table><tr><td>Operativsystem:</td><td>Windows</td></tr>"} else {osSYS="<table><tr><td>Operativsystem:</td><td>ikke Windows</td></tr>"};
MSIEOffset=usag.indexOf("MSIE ");
if (MSIEOffset==-1) {btype="<tr><td>Browser:</td><td>ikke Microsoft Internet Explorer</td></tr>"} else {btype="<tr><td>Browser:</td><td>Microsoft Internet Explorer<td>";vbver=parseFloat(usag.substring(MSIEOffset+5,usag.indexOf(";",MSIEOffset)))};
if (MSIEOffset==-1) {bver=""} else {bver="<tr><td>Browser version:</td><td>"+vbver+"</td></tr>"};
if (usag.indexOf("MathPlayer")==-1){mp="<tr><td>MathPlayer-PlugIn:</td><td>Mangler</td></tr>"} else {mp="<tr><td>MathPlayer-PlugIn:</td><td>OK</td></tr>"};
browsertype.innerHTML="<b>Information om din browser</b><br>"+osSYS+btype+bver+mp+"</table>";
}

//writing the menu:
function an(){document.write("<div class='animat'>Animationer</div><table>")}
function fo(){document.write("<div class='animat'>Formelsamling</div><table>")}
function ts(){document.write("</table>")}
function umhs(){document.write("</div>")}

function wumh(navn,top,hoved){document.write("<div id='"+navn+"' style='top:"+top+"px' class='umenu' onMouseOver='vis(this)' onMouseOut='skjulmenu()'><b>"+hoved+"</b>");}
function wmpa(mapp,tekst){document.write("<tr><td><a href='#' onClick=\"skjulmenu();onif('../animat/"+mapp+"/index.html',840,540)\">"+tekst+"</a></td></tr>");}
function wmpf(fil,tekst){document.write("<tr><td><a href='#' onClick=\"skjulmenu();onif('../formelsamling/"+fil+"',740,455)\">"+tekst+"</a></td></tr>");}