var previousClassName ="";

function toolActive(toolid) {
  for (var i = 0; i < icon_tools.length; i++) {
    var elemt = document.getElementById(icon_tools[i] + "_icon");

    if(elemt == null) return;
    
    if (icon_tools[i] == toolid) {
      elemt.className = "toolbar_on";
      previousClassName = "toolbar_on";
    } else {
      elemt.className = "toolbar_off";
    }
  }

}


function toolOver(toolid) {

    var elemt = document.getElementById(toolid + "_icon");

    if(elemt == null) return;

      previousClassName = elemt.className;
      elemt.className = "toolbar_over";
      
}

function toolOut(toolid) {

    var elemt = document.getElementById(toolid + "_icon");

    if(elemt == null) return;
    
      elemt.className = previousClassName;

}