Create variables from URL variable passing

[Darkmatter5]

If I have the following URL

 

http://www.site.com/res_filing.php?cab=4&fol=1&item=8

 

How can I extract cab, fol and item from the url into variables named cab_id, fol_id and item_id for use in a javascript function?

[Psycho]

function getURLVar(varName) {
  url = unescape(self.document.location);
  if (varstring = url.substring(url.indexOf('?')+1)) {
    varpairs  = varstring.split(/&/);
    for (i=0; i<varpairs.length; i++) {
      varpair = varpairs[i].split(/=/);
      if (varName==varpair[0]) { return varpair[1]; }
    }
  }
  return false;
}

var cab_id  = getURLVar(cab);
var fol_id  = getURLVar(fol);
var item_id = getURLVar(item);