how to clear variables in url

[Darkmatter5]

I have  this script running

 

function reload(form, type) {
    var cab=form.cabinet_lst.options[form.cabinet_lst.options.selectedIndex].value;
    var fol=form.folder_lst.options[form.folder_lst.options.selectedIndex].value;
    var item=form.item_lst.options[form.item_lst.options.selectedIndex].value;
    if (type=="cab") { self.location='res_filing.php?cab=' + cab ; }
    if (type="fol") { self.location='res_filing.php?cab=' + cab +'&fol=' + fol ; }
    if (type="item") { self.location='res_filing.php?cab=' + cab +'&fol=' + fol +'&item=' + item ; }
}

 

I also have some PHP that run that puts a variable in the url named editcab.  When the reload javascript is activated the editcab variable is still passed, how can I clear all url variables, before running the self.location lines in the javascript?