function jsUpload(upload_field){						
	// this is just an example of checking file extensions
	// if you do not need extension checking, remove 
	// everything down to line
	// upload_field.form.submit();
	
	var re_text = /\.jpg|\.gif|\.png/i;
	var filename = upload_field.value;

	/* Checking file type */
	if (filename.search(re_text) == -1)
	{
		document.getElementById('avatar_image_tooltip').style.display = 'none';
		document.getElementById('avatar_image_err').style.display = 'block';
		document.getElementById('avatar_image_err').innerHTML = 'Sorry, we can’t accept this file format';
		upload_field.form.reset();
		return false;
	}

	upload_field.form.submit();
	document.getElementById('avatar_button').disabled=true; 
	document.getElementById('avatar_button').className='button-common d-button120';
	document.getElementById('avatar_image_tooltip').style.display = 'none';
	document.getElementById('avatar_image_err').style.display = 'none';
	document.getElementById('avatar_image_uploading').style.display = 'block';
	upload_field.disabled = true;
	return false;
}