选中复选框后按钮可用，不选中不可用

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function agree_change(){
  		if($("#agree").attr("checked")=="checked"){
  			$("#agree").attr("checked",false)
  			$("#toubiao_submit").attr("disabled",true);
  			$("#toubiao_submit").removeClass("toubiao_btn_able");
  			$("#toubiao_submit").addClass("toubiao_btn_disable");
  		} else {
  			$("#agree").attr("checked","checked")
  			$("#toubiao_submit").attr("disabled",false);
  			$("#toubiao_submit").removeClass("toubiao_btn_disable");
  			$("#toubiao_submit").addClass("toubiao_btn_able");
  		}
	}