function get_browser()
{
var bver=null;
if(document.layers)
{bver='nn4';
}
else if(document.all)
{
if(window.opera)
  {bver='opera';
  }
else
  {bver='ie4';
  }
}
else if(document.getElementById)
{
if(navigator.userAgent.indexOf('gecko')>-1)
  {bver='mozilla';
  }
else
  {bver='nn6';
  }
}
if((window.opera)&&((navigator.appVersion.indexOf('MSIE 5.0')>-1)||(parseInt(navigator.appVersion)==6)))
{
bver='opera6';
}
return bver;
}

function replace_tags(STR,STR1,STR2)
{
var rexp,S;
S=STR;
rexp=new RegExp(STR1,"gi");
S=S.replace(rexp,STR2);
return S;
}

function preloadImg(file) {
  img = new Image();
  img.src = file;
}

function NewWindow(w,v,s,d){
  eval("window.open('"+v+"','"+w+"','height="+s+",width="+d+",left="+(screen.width - s)/2+",top="+(screen.height - d)/2+",status=no,location=no,toolbar=no,directories=no,menubar=no');");
}

function change_image(elname, srcname) {
if (srcname=='1') {
  elname.src=replace_tags(elname.src,'\.gif','_over.gif');
}
else {
  elname.src=replace_tags(elname.src,'_over.gif','\.gif');
}
}

function NewWindow3(w,v,s,d)
{
eval("window.open('"+v+"','"+w+"','height="+s+",width="+d+",status=no,location=no,toolbar=no,directories=yes,menubar=yes');");
}