function displayLogin()
{
	centre('popinLogin');
	$('#popinLogin').toggle();
}


function displayEvenement(url)
{
	centre('popinEvenement');
	$('#iframePopinEvenement').attr('src', url);
	$('#popinEvenement').show();
}

function centre(element)
{
	var scrOfX = 0, scrOfY = 0, pageWidth = 0, pageHeight = 0;

	pageWidth =  window.innerWidth;
	pageWidth = (pageWidth)? pageWidth : document.documentElement.clientWidth;
	pageWidth = (pageWidth)? pageWidth: document.body.clientWidth;
	
	pageHeight =  window.innerHeight;
	pageHeight = (pageHeight)? pageHeight: document.documentElement.clientHeight;
	pageHeight = (pageHeight)? pageHeight: document.body.clientHeight;
  
	if( typeof( window.pageYOffset ) == 'number' ) {
		scrOfY = window.pageYOffset;
		scrOfX = window.pageXOffset;
	} else if( document.body && ( document.body.scrollLeft || document.body.scrollTop ) ) {
		scrOfY = document.body.scrollTop;
		scrOfX = document.body.scrollLeft;
	} else if( document.documentElement && ( document.documentElement.scrollLeft || document.documentElement.scrollTop ) ) {
		scrOfY = document.documentElement.scrollTop;
		scrOfX = document.documentElement.scrollLeft;
	}

	var myDiv = document.getElementById(element);
	var posLeft = (pageWidth - parseInt(myDiv.style.width))/2;
	
	myDiv.style.left = (posLeft<0)?0+"px":posLeft+"px";
	var posTop = (scrOfY + (pageHeight - parseInt(myDiv.style.height))/2);
	myDiv.style.top = (posTop<0)?0+"px":posTop+"px";
  
	//setTimeout("centre('popinLogin')",1);
}