function UntarFiles() {
    if (document.RunForm.runs.selectedIndex==-1)
    {
		    alert("Please make a selection from the list.");
        return false;
    }
	
	  var env = document.getElementById("env").value;
	  var runs = document.getElementById("runs").value;

    var url = "atlanta_combine_postscript.cgi?&env=" + escape(env) + "&runs=" + escape(runs); 
    
    request.open("GET", url, true);

    request.onreadystatechange = IssueAlert;

    request.send(null);
}