// JavaScript Document
function size() {
    var myWidth;
    var myHeight;
    if (typeof (window.innerWidth) == 'number') {


        //Non-IE 

        myWidth = window.innerWidth;
        myHeight = window.innerHeight;

    } else if (document.documentElement &&

(document.documentElement.clientWidth || document.documentElement.clientHeight)) {

        //IE 6+ in 'standards compliant mode' 

        myWidth = document.documentElement.clientWidth;
        myHeight = document.documentElement.clientHeight;

    } else if (document.body && (document.body.clientWidth || document.body.clientHeight)) {

        //IE 4 compatible 

        myWidth = document.body.clientWidth;
        myHeight = document.body.clientHeight;
    }
    document.getElementById("com").style.width = myWidth - 510 + "px";


}

window.onresize = size;
window.onload = size;