windows.onload()  调用 必须等到页面内包括图片的所有元素加载完毕后才能执行。window.onload = Checkbox_Click. Checkbox_Click is a js function.不能同时编写多个，如果有多个window.onload方法，只会执行一个 与$(document).ready区别：$(document).ready()是D

1. Add a new hidden button. Make sure its diplay is none. set its width and height be same with the submit button.inputid="btnSubmitHide"type="button"value="Submit&Next"style="display: