Extract GET Style Query Variables

extractQueryArgs.js

// 
// Extract GET style query parameters from string.
function extractQueryArgs( query ) {
	if ( typeof query !== 'string' )
		return false;

	// This function is anonymous, is executed immediately and 
	// the return value is assigned to QueryString!
	var params = {};
	var vars = query.split("&");
	for (var i=0;i<vars.length;i++) {
		var pair = vars[i].split("=");
			// If first entry with this name
		if (typeof params[pair[0]] === "undefined") {
			params[pair[0]] = pair[1];
			// If second entry with this name
		} else if (typeof params[pair[0]] === "string") {
			var arr = [ params[pair[0]], pair[1] ];
			params[pair[0]] = arr;
			// If third or later entry with this name
		} else {
			params[pair[0]].push(pair[1]);
		}
	} 

	return params;
};