js獲取URL參數

	function getQueryVariable(variable)//獲取sid
	{
		var query = window.location.search.substring(1);
		var vars = query.split("&");
		for (var i=0;i<vars.length;i++) {
			var pair = vars[i].split("=");
			if(pair[0] == variable){return pair[1];}
		}
		return(false);
	}
	var sid=getQueryVariable("sid");