This page describes a method for getting these values:

<script type="text/javascript"
        src="scriptaculous.js?load=effects,builder"></script>

And the javascript:

function getJSvars(script_name, var_name, if_empty) {
    var script_elements = document.getElementsByTagName(‘script’);

    if(if_empty == null) {
        var if_empty = ”;
    }

    for (a = 0; a < script_elements.length; a++) {
       var source_string = script_elements[a].src;
           if(source_string.indexOf(script_name)>=0) {

           var_name = var_name.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
           var regex_string = new RegExp("[\\?&]"+var_name+"=([^&#]*)");
           var parsed_vars = regex_string.exec(source_string);
           if(parsed_vars == null) { return if_empty; }
           else { return parsed_vars[1]; }

          }
       }
    }

This page describes a method for getting these values:

<script type="text/javascript"
        src="scriptaculous.js?load=effects,builder"></script>

And the javascript:

function getJSvars(script_name, var_name, if_empty) {
    var script_elements = document.getElementsByTagName(‘script’);

    if(if_empty == null) {
        var if_empty = ”;
    }

    for (a = 0; a < script_elements.length; a++) {
       var source_string = script_elements[a].src;
           if(source_string.indexOf(script_name)>=0) {

           var_name = var_name.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
           var regex_string = new RegExp("[\\?&]"+var_name+"=([^&#]*)");
           var parsed_vars = regex_string.exec(source_string);
           if(parsed_vars == null) { return if_empty; }
           else { return parsed_vars[1]; }

          }
       }
    }