//iframe ÖÐ¼Ó onload="sizeChange(600, 'main')" 
function sizeChange(aHeight, aFrameName) {
    
    var iHeight = 600;
    if (aHeight) {
        iHeight = aHeight;
    }
    var strFrameName = "main";
    if (aFrameName) {
        strFrameName = aFrameName;
    }

    var newWindowHeight = parseInt(eval(strFrameName).document.body.scrollHeight)
    if (newWindowHeight < iHeight) {
        newWindowHeight = iHeight
    }
    document.getElementById(strFrameName).style.height = newWindowHeight + "px";
}