function marginByBrowser() {
	// get browser name
	browser = navigator.appName;

	// check img width by browser bane
	if (browser == 'Microsoft Internet Explorer') {
		// check ie version, the function not work on ie8
		var ie = ieVersion();
		// if(ie > 7)
		document.getElementById('searchButton').style.marginTop = '51px';
	}
}
/**
 * change classes for comments images on load page
 */
function indexLoadPage() {
	// change button margin
	marginByBrowser();

	// check page name
	page = pageName();
	if (page == 'index.php') {
		// change comments images class
		document.getElementById('comment1').className = 'comment_thumb_image';
		document.getElementById('comment2').className = 'comment_thumb_image';
	}
}
/**
 * change comment boxes on load index page
 * @return
 */
function indexComments() {
	// change comments images class
	document.getElementById('comment1').className = 'comment_thumb_image';
	document.getElementById('comment2').className = 'comment_thumb_image';
}