function joinElements(obj,separator){
		var str='',i=0;
		for(var key in obj){
			if (typeof(obj[key])=='number' || typeof(obj[key])=='string' || typeof(obj[key])=='boolean') {
				str+=obj[key]+separator;
			}
			i++;
		}	
		str = str.substring(0,str.lastIndexOf(separator));		  
		return str;
	}