function agrandirMilieu()  
{		
	    centre = document.getElementById('contenuCentre');
		var elems = document.getElementsByTagName("*"); 
		var j = 0;
		for ( var i = 0; ( elem = elems[i] ); i++ ) 
		{ 
			if ( elem.className == 'contenuInterneDroite' ) 
			{ 
				j++;
			} 
		} 
		if (j == 0)
		{
			centre.style.width = "100%"; 
		}
} 

if (window.attachEvent) { window.attachEvent("onload", agrandirMilieu); }
else { window.addEventListener('load', agrandirMilieu, false);}