[sarik]

<script>
 var img_r = new Image();
 img_r.src = "http://starlexx.com/Touareg/2.png";
 function img_size(val){
 var kartinka = document.getElementById("kartinka");
 kartinka.src = img_r.src;
 var img = new Image();
 img.onload = function() {
 kartinka.src = this.src
    };
	
	
 switch(val){
 case "2":
   img.src = "http://starlexx.com/Touareg/img/4.png";
   break;



 }
}

 </script>

<input type="radio" value="2" onclick="img_size(this.value)"/>
<img id="kartinka" src="http://starlexx.com/Touareg/img/2.png" align="right" border="0"/>