window.onload = function ()
{
    
        var w = document.documentElement.clientWidth;
        var r = 260;
        var l = 300;
        var c = document.getElementById("content");
        
  
            c.style.width = w - r - l + "px";


}




window.onresize = function ()
{
    
        var w = document.documentElement.clientWidth;
        var r = 260;
        var l = 300;
        var c = document.getElementById("content");
        
    
            c.style.width = w - r - l + "px";
        
}