function imageEX(){
var s = Math.floor(Math.random()*2)
if ( s ==  0 ) document.write('<img src="share/header_img011.jpg" width="692" height="128" usemap="#header" border="0">');
if ( s ==  1 ) document.write('<img src="share/header_img012.jpg" width="692" height="128" usemap="#header" border="0">');
}