< The script type = “text/javascript” > The function toggle () {   TheObj = document. GetElementById (’ Sunyanzi). Style;   If (  Theobj. display == “none”) theobj. display = “block”; The else theObj. The display = “none”; } < / script> < Div id = “Sunyanzi” style = “display: none” > There I am. / div> < Br / > < Input type=“button” onclick=“toggle()” value=” ?” / >

Two methods: remove and hide

// create your pop-up layer           Var dvMsg = document. The createElement method (” div ”);         StrHtml =   ”< Div class = ’# # # #’ > Pop-up layer content < / div>”       StrHtml + = ”< Div class = ’# # # #’ > < Input type=‘button’ value=’ close ‘onclick=‘btnclick()’> < / div>”       DvMsg. InnerHTML = strHtml;             Document. The body. The appendChild (dvMsg); // close button         Btnclick = function () {                                                  Document. Body. RemoveChild (dvMsg);

------------------------- Or the pop-up layer is marked with div id

< Div id = “tanchu” > Pop-up layer content < / div>

**In js **The function open () { Document. The getElementById (tanchu). Style. The display = "";   / / show } The function close () { Document. The getElementById (tanchu). Style. The display = “none”;   // not displayed (same load when page is initialized) }