function obret(pagina,ample,alt,scroll,imatge,text)
{
	if (scroll=="si")d=1;
	if (scroll=="no")d=0;
	if (scroll=="")d=0;
	
	LeftPosition = (screen.width) ? (screen.width-ample)/2 : 0;
	TopPosition = (screen.height) ? (screen.height-alt)/2 : 0;
	
	finesnota=window.open(pagina+"?"+escape(imatge)+"&"+escape(text),"xyz","toolbar=0,location=0,directories=0,scrollbars="+d+",menubar=0,status=0,resizable=0,width="+ample+",height="+alt+",left="+LeftPosition+",top="+TopPosition+""); 
}