class on body

HI WP users ??

i need to apply a “display:none;” style to a div in my header only when i’m on the home.php.

i try to fo it like :

in the css :

body.single-author.pageTitre{
	 	display:none;
	 }

OR n the header :

<script type="text/javascript">
    	$(document).ready(function(){
    		$("body.home.pageTitre").css("display","none");

    	});
    </script>

but i don’t have the result i need i don’t understand my error… if someone can help me it where appreciable ??

thanks !