iframe frame 自动适应所包含的页面大小
function SetWinHeight(obj) { var win=obj; if (document.getElementById) { if (win && !window.opera) { if (win.contentDocument && win.contentDocument.body.offsetHeight) win.height = win.contentDocument.body.offsetHeight; else if(win.Document && win.Document.body.scrollHeight) win.height = win.Document.body.scrollHeight; } } }