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<script type="text/javascript">
    function getUrlVars() {
        var vars = {};
        var parts = window.location.href.replace(/[?&]+([^=&]+)=([^&]*)/gi, function(m,key,value) {
            vars[key] = value;
        });
        return vars;
    }

    function getUrlParam(parameter, defaultvalue){
        var urlparameter = defaultvalue;
        if(window.location.href.indexOf(parameter) > -1){
            urlparameter = getUrlVars()[parameter];
            }
        return urlparameter;
    }

    alert(getUrlParam('color'));
    alert(getUrlParam('size'));
</script>