iOS mouse event handling

gistfile1.js

function touchHandler(event) {
    var touches = event.changedTouches,
        first = touches[0],
        type = "";
        switch(event.type){
            case "touchstart": type = "mousedown"; 
              break;
            case "touchmove":  type="mousemove"; 
              break;        
            case "touchend":   type="mouseup"; 
              break;
            default: return;
        }
    
    var simulatedEvent = document.createEvent("MouseEvent");
    simulatedEvent.initMouseEvent(type, true, true, window, 1, 
                              first.screenX, first.screenY, 
                              first.clientX, first.clientY, false, 
                              false, false, false, 0/*left*/, null);

    first.target.dispatchEvent(simulatedEvent);
    event.preventDefault();
}

function init() 
{
    document.addEventListener("touchstart", touchHandler, true);
    document.addEventListener("touchmove", touchHandler, true);
    document.addEventListener("touchend", touchHandler, true);
    document.addEventListener("touchcancel", touchHandler, true);    
}