function getParam(key){
	var tmp = new Array();
	var tmp2 = new Array();
	var param = new Array();
	 
	var get = location.search;
	if(get != '')
	{
	    tmp = (get.substr(1)).split('&');
	    for(var i=0; i < tmp.length; i++)
	    {
	        tmp2 = tmp[i].split('=');
	        param[tmp2[0]] = tmp2[1];
	    }

		if(param[key]!=null) {
			return param[key];
		} else {
			return null;
		}
	} else {
		return null;
	}
}