function tailleImage()
{
        var screenW = 0, screenH = 0;
	if( typeof( window.innerWidth ) == 'number' )
	{
		//Non-IE
		screenW = window.innerWidth;
		screenH = window.innerHeight;
	}
	else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) )
	{
		//IE 6+ in 'standards compliant mode'
		screenW = document.documentElement.clientWidth;
		screenH = document.documentElement.clientHeight;
	}
	else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) )
	{
		//IE 4 compatible
		screenW = document.body.clientWidth;
		screenH = document.body.clientHeight;
	}


	monObj = document.getElementById("fond");


		if (screenH/screenW <= 760/1024)
	{
		//100% largeur
		monObj.style.width = screenW+"px";
		monObj.style.height = screenW*760/1024+"px";

	}else if (screenH/screenW > 760/1024)
	{
		//100% hauteur
		monObj.style.width  = screenH*1024/760+"px";
		monObj.style.height = screenH+"px";
	}


	//var margeDivScroll = 75;

	//document.getElementById("scroll").style.height = (screenH*77/100-8-margeDivScroll)+"px";
	//document.getElementById("cadreblanc").style.height = screenH-20+"px";
	//document.getElementById("cadreblanc").style.width = screenW-20+"px";

}

function tailleBloc()
{
	var screenW = 0, screenH = 0;
	if( typeof( window.innerWidth ) == 'number' )
	{
		//Non-IE
		screenW = window.innerWidth;
		screenH = window.innerHeight;
	}
	else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) )
	{
		//IE 6+ in 'standards compliant mode'
		screenW = document.documentElement.clientWidth;
		screenH = document.documentElement.clientHeight;
	}
	else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) )
	{
		//IE 4 compatible
		screenW = document.body.clientWidth;
		screenH = document.body.clientHeight;
	}


	//var margeDivScroll = 75;

	//document.getElementById("Scroll").style.height = (screenH*77/100-8-margeDivScroll)+"px";

}

<!--
function MM_reloadPage(init)
{  //reloads the window if Nav4 resized
	if (init==true) with (navigator)
	{
		if ((appName=="Netscape")&&(parseInt(appVersion)==4))
		{
			document.MM_pgW=innerWidth; document.MM_pgH=innerHeight; onresize=MM_reloadPage;
		}
	}
	else if (innerWidth!=document.MM_pgW || innerHeight!=document.MM_pgH) location.reload();
}
MM_reloadPage(true);
//-->