jQuery(document).ready(function($){	
	jQuery('#logo a img').hover(ChangeLogo);

	var targetS = 'span#GoToTop';
	
	jQuery(targetS).css('display', 'none');
	
	jQuery(targetS).click(goToByScroll);
	
	jQuery(window).scroll(DisplayElement);
});

function goToByScroll(e){
     jQuery('html,body').animate({scrollTop: 0},'slow');
     jQuery('span#GoToTop').fadeOut('slow');
}


function DisplayElement(Evenement){
	var element = jQuery('span#GoToTop');
	var currentScrollTop = jQuery(window).scrollTop(); 

	if(element.css('display') == 'none' && currentScrollTop >= 280) element.fadeIn('slow');
	else if(element.css('display') == 'block' && currentScrollTop <= 280) element.fadeOut('slow');

}

function ChangeLogo(){
	var prefixe = 'wp-content/uploads/2011/08/';
	var oldLogo = 'logo';
	var newLogo = 'logo-actif';
	
	var logo = jQuery('#logo a img').attr('src').split('/');
	logo = logo[logo.length-1].split('.');
	if(logo[0] == oldLogo) jQuery('#logo a img').attr('src', prefixe + newLogo + '.' + logo[1]);
	else jQuery('#logo a img').attr('src', prefixe + oldLogo + '.' + logo[1]);
}