/* This script and many more are available free online at
  The JavaScript Source!! http://javascript.internet.com
  Created by: Steve Chipman | http://slayeroffice */
  
  var mDown = false;
  var offsetX=0;
  var offsetY=0;
  function init() {
          document.onmousedown = captureMouseDown;
          document.onmousemove = captureMouseMove;
          document.onmouseup = captureMouseUp;
          document.getElementById("marker").onmousedown = captureOffset;
          document.getElementById("marker").style.top = "0px";
          document.getElementById("marker").style.left = "0px";
  }
  
  function captureOffset(e) {
          x = parseInt(document.getElementById("marker").style.left);
          y = parseInt(document.getElementById("marker").style.top);
          if(document.all) {
                  offsetX=window.event.clientX - x;
                  offsetY=window.event.clientY - y;
          } else {
                  offsetX = e.pageX - x;
                  offsetY = e.pageY - y;
          }
  }
  
  function captureMouseDown() {
          mDown=true;
  }
  
  function captureMouseUp() {
          mDown = false;
  }
  
  function captureMouseMove(e) {
          if(!mDown)return;
          x = document.all?window.event.clientX - offsetX:e.pageX - offsetX;
          y = document.all?window.event.clientY - offsetY:e.pageY - offsetY;
          
          if(x<=-1 || x>=175 || y<=-1 || y >= 105)return;
          document.getElementById("marker").style.left = x + "px";        
          document.getElementById("marker").style.top = y + "px";
  
          x2 = parseInt(document.getElementById("marker").style.left);
          y2 = parseInt(document.getElementById("marker").style.top);
          x2 = (x2 - (x2*2))*2; 
          y2 = (y2 - (y2*2))*2;
          document.getElementById("largeImage").style.backgroundPosition = x2 + "px " + y2 + "px";
  }
  
  // Multiple onload function created by: Simon Willison
  // http://simonwillison.net/2004/May/26/addLoadEvent/
  function addLoadEvent(func) {
    var oldonload = window.onload;
    if (typeof window.onload != 'function') {
      window.onload = func;
    } else {
      window.onload = function() {
        if (oldonload) {
          oldonload();
        }
        func();
      }
    }
  }
  
  addLoadEvent(function() {
    init();
  });