var bDiv;

window.onload = function() 
{
	  bDiv = document.createElement('div');
	  document.body.appendChild(bDiv);
	  
	  var bFrm = document.createElement('iframe');
	  bFrm.src = 'about:blank';
	  
	  bDiv.style.position = 'absolute';
	  bDiv.style.top = '-1300px';
	  bDiv.style.left = '0px';
	  bDiv.style.width = bFrm.style.width = '670px';
	  bDiv.style.height = bFrm.style.height = '400px';
	  
	  bDiv.appendChild(bFrm);
	  bDiv.frame = bFrm;
	  
	  document.bDiv = bDiv;
}

function apercu(url)
{
	  document.bDiv.frame.setAttribute('src', '/achats/' + url);
	  window.setTimeout(function(){
		    document.bDiv.style.display = '';
		    document.bDiv.style.top = (document.documentElement.clientHeight - 400)/2 + 'px';
		    moveDiv()
		    }
		    , 1000);

}

function moveDiv()
{
	  var curValue = parseInt(document.bDiv.style.left);
	  var targetValue = (document.documentElement.clientWidth - 670)/2;
	  if(targetValue - curValue < 1)
		    curValue = targetValue;
	  if(curValue < targetValue)
		    curValue += targetValue / 20;
	  document.bDiv.style.left = curValue + 'px';
	  if(curValue < targetValue)	
		    window.setTimeout('moveDiv()', 20);
}