function resize_iframe() { //resize the iframe according to the size of the //window (all these should be on the same line) document.getElementById("inxs_iframe").height= document.body.offsetHeight- document.getElementById("inxs_iframe").offsetTop-8; } // this will resize the iframe every // time you change the size of the window. window.onresize=resize_iframe; //Instead of using this you can use: //