O sea que el archivo seria algo como:
Código PHP:
function abrir(valor){
eval('Popup=window.open("'+valor+'.htm","Popup"," width=800,height=450,top=0,left=0,resizable=yes,scrollbars=yes,menubar=yes,toolbar=yes,status=yes,location=yes")')}
function launch(){
x=window.open("previewforo.htm","WindowName"," width=900,height=600,top=0,left=0,resizable=yes,scrollbars=yes,menubar=yes,toolbar=yes,status=yes,location=yes")
var ventana = window.self;
ventana.opener = window.self;
ventana.close();
}