/**
 * TextArea class as a deal TextArea util
 * @author:yinji
 */
var TextArea = new (function() {
	this._scrollHeight = function() {
		var objs = document.getElementsByTagName("textarea");
		for(var i=0;i<objs.length;i++){
			if(objs[i]&&objs[i].id==""){
				if(objs[i].className=='queryTextarea'){
					objs[i].style.posHeight = objs[i].scrollHeight;
				}
			}
		}	
	}
})();