var oPop = null;
var oEvt = null;
var oImg = null;

function intClosePreview()
{
	if( oPop )
		oPop.hide();
	oPop = null;
	oEvt = null;
	oImg = null;
}

function intOnLoadImg()
{
	if( oPop == null )
		return;
	var oObj = oPop.document.images.item(0);
	var w = oObj.width;
	var h = oObj.height;
	if( w > 450  ||  h > 300 )
	{
		ratio = h / w;
		w = 450;
		h = w * ratio;
	}
	else if( h > 300 )
	{
		ratio = w / h;
		h = 300;
		w = h * ratio;
	}
	oObj.width = w;
	oObj.height = h;
	oImg.attachEvent( "onmouseout", intClosePreview );
	oPop.show( oEvt.offsetWidth,oEvt.offsetHeight/2, w,h, oEvt );
}


function DoFotoPreview( filename )
{
	if( oPop )
		return;
	oEvt = window.event.toElement;

	oPop = window.createPopup();
	oPop.document.body.innerHTML = "<IMG border='0' name='theImg' src=\"public/"+filename+"\">";
	oPop.show( 1,1,1,1 );
	oImg = oPop.document.all.item("theImg");
	oImg.attachEvent( "onload", intOnLoadImg );
}


function CloseFotoPreview()
{
	var oObj = window.event.toElement;
	if( oObj != null  &&  oObj != oEvt )
	{
		if( oPop )
		{
			oPop.hide();
			oPop = null;
			oImg = null;
		}
		oEvt = null;
	}
}