add:  oMask.src = "blank.html"; 
context: 	__create_mask : function( )	{		var oMask = document.createElement( 'iframe' );		oMask.style.position = 'absolute';		oMask.style.top = '0px';		oMask.style.left = '0px';		oMask.style.width = '100%';		var height = BirtPosition.viewportHeight( );		oMask.style.height = height + 'px';		oMask.style.zIndex = '300';		oMask.style.backgroundColor = '#dbe4ee';		oMask.style.filter = 'alpha( opacity = 0.0 )';		oMask.style.opacity = '.0';		oMask.scrolling = 'no';		oMask.marginHeight = '0px';		oMask.marginWidth = '0px';		oMask.style.display = 'none';		document.body.appendChild( oMask );				return oMask;			},
meta: 855	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/855/a196b1cd7cae76ae356ca3d5febe634759cbd48a/BirtProgressBar.js/buggy/viewer/org.eclipse.birt.report.viewer/birt/webcontent/birt/ajax/ui/app/BirtProgressBar.js