var col1_width;
var col3_marginLeft;

if ((document.cookie) && (document.cookie.search("hide_sidemenu=true") != -1)) {
  restore_sidemenu();
}

function restore_sidemenu() {
   var col1 = document.getElementById('col1');
   var colr = document.getElementById('colr');
   var col3 = document.getElementById('col3');

   if (document.cookie.search("hide_sidemenu=true") != -1)  {
        // save styles for restoration
        col1_width = col1.style.width;
        col3_marginLeft = col3.style.marginLeft;
        col1.style.width = "0px";
        col3.style.marginLeft = "2em";
		col1.style.display = "none";
		colr.style.display = "block";
   } else {
        col1.style.width = col1_width;
        col3.style.marginLeft = col3_marginLeft;
		col1.style.display = "inline";
		colr.style.display = "none";
   }
}

function toggle_sidemenu() {
   var hide = (document.cookie.search("hide_sidemenu=true") != -1) ? "false" : "true";
   document.cookie = "hide_sidemenu=" + hide +"; path=/;";
   restore_sidemenu();
}