var webcastImage = "http://media.corporate-ir.net/media_files/irol/18/188894/images/1-microphone.png";


 

 function swapImages()
 {
 	
 	var docImages = document.getElementsByTagName("img");
     
	 
	 for(var i = 0; i < docImages.length; i++)
	 {
	 	
		var tempImage = docImages[i].src;
		var imageName = tempImage.substr(tempImage.lastIndexOf("/") + 1);
		
		switch(imageName)
		{
		
		case "microphone_small.gif":
			docImages[i].src=webcastImage;
			break;	

                case "microphone2.gif":
	                docImages[i].src=webcastImage;
	                break;	
			 	}
	 }
	
 
 }