function serializeForm(f) {
	var query = "";
	for (var i = 0; i < f.elements.length; i++) {
		var elem = f.elements[i];
		var vals = [];
		if (elem && elem.type) {
			switch (elem.type) {
				case "checkbox":
				case "radio":
					if (elem.checked) { 
						vals.push(elem.value);
					}
					break;
				case "select-one":
					vals.push(elem.options[elem.selectedIndex].value);
					break;
				case "select-multiple":
					for (var j = 0; j < elem.options.length; j++) {
						if (elem.options[j].selected) {
							vals.push(elem.options[j].value);
						}
					}
					break;
				case "hidden":
				case "text":
				case "password":
				case "textarea":
					vals.push(elem.value);
					break;
			}
			for (var j = 0; j < vals.length; j++) {
				if (query.length > 0) { query += "&"; }
				query += encodeURIComponent(elem.name) + "=" + encodeURIComponent(vals[j]);
			}
		}
	}
	return query;
}				

var f = document.forms[0];
var q = "myvar=value&" + serializeForm(f);