I'm trying to get an image zoomed in & out by two zoom buttons (+) & (-). The problem is that "zooming in" stops when the image is full screen size (width 100%). I need to zoom the image much bigger than the screen size. Just can't figure it out how to o that. I'm beginner with Javascript so I hope someone have motivation to help me this little Javascript problem.

I wonder is there any simple zoom in/out/reset plugins that works with zoom buttons? Image grab would be more than cool also.

Thanks again!

```js
function zoomin(){
        var myImg = document.getElementById("map");
        var currWidth = myImg.clientWidth;
        if(currWidth == 2500) return false;
         else{
            myImg.style.width = (currWidth + 100) + "px";
        } 
    }
    function zoomout(){
        var myImg = document.getElementById("map");
        var currWidth = myImg.clientWidth;
        if(currWidth == 100) return false;
   else{
            myImg.style.width = (currWidth - 100) + "px";
        }
    }
```

```css
*body {
  margin: 0;
}
#navbar {
 overflow: hidden;
 background-color: #099;
 position: fixed;
 top: 0;
 width: 100%;
 padding-top: 3px;
 padding-bottom: 3px;
 padding-left: 20px;
}
#navbar a {
  float: left;
  display: block;
  color: #666;
  text-align: center;
  padding-right: 20px;
  text-decoration: none;
  font-size: 17px;
}
#navbar a:hover {
  background-color: #ddd;
  color: black;
}
#navbar a.active {
  background-color: #4CAF50;
  color: white;
}
.main {
  padding: 16px;
  margin-top: 30px;
}
.main img {
 max-width: 100%;
 height: auto;
}
.button {
  width: 300px;
  height: 60px;
}
```

```html
</head>
<body>

<div id="navbar">
<button type="button" onclick="zoomin()"> Zoom In</button>
<button type="button" onclick="zoomout()"> Zoom Out</button>
</div>

<div class="main">
<img id="map" src="http://www.worldatlas.com/webimage/countrys/europelargesm.jpg" />
</div>
```

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