Content page question

I have this from an ordinary web page, but If I'm going to replace that web page with a content page, where do I put the attributes found in the body tag of the page, since content page has no body tag? Can the onload and oninit function work the same way in a code behind of the content page? Thanks
<body class="BackgroundLightest" MS_POSITIONING="GridLayout" leftMargin="0" topMargin="0" marginwidth="0" marginheight="0" onload="InitMenu();" onresize="InitMenu(); P7_ReDoIt()">   ...