Image File content type client side validation in Java Script

Try the following code as a java script.......
=================================================================
function fileUploadValidation(){
if(document.getElementById('file1').value != ''){
          var fileName  = document.getElementById('file1').value;
          var ext = fileName.substring(fileName.lastIndexOf('.') + 1);
          if(ext == "gif" || ext == "GIF" || ext == "JPEG" || ext == "jpeg" || ext == "jpg" || ext == "JPG" || ext == "png" || ext == "PNG" ){
                 return true;              
            }else{
             alert("Upload Gif, Jpg or Png images only!");
             document.getElementById('file1').value="";
             return false;
          }
}
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