function setSize(target, param){
		var state = $.data(target, 'slider');
		var opts = state.options;
		var slider = state.slider;
		
		if (param){
			if (param.width) opts.width = param.width;
			if (param.height) opts.height = param.height;
		}
		slider._size(opts);
		if (opts.mode == 'h'){
			slider.css('height', '');
			slider.children('div').css('height', '');
		} else {
			slider.css('width', '');
			slider.children('div').css('width', '');
			slider.children('div.slider-rule,div.slider-rulelabel,div.slider-inner')._outerHeight(slider._outerHeight());
		}
		initValue(target);
	}
set the slider size, for vertical slider, the height property is required