function miseEnpageMain(){
	mainDiv = document.getElementById("main");
	var largTotal = document.body.clientWidth-20;
	var largContenu = mainDiv.offsetWidth;
	
	var margeH = Math.round((largTotal-largContenu)/2);
	
	var strstyle="";
	strstyle+="<style type=\"text/css\">\n";
	

	strstyle+="#main{\n";
	if(margeH>0){
		strstyle+="    margin-left: "+margeH+"px;\n";
			strstyle+="   margin-right: "+margeH+"px;\n";
	}
	strstyle+="}\n";
  strstyle+="</style>\n";
	document.write(strstyle);
}