function popup( url, newWidth, newHeight, newToolbar ){
	newToolbar = newToolbar || 'no';

	if( newWidth == 'max' ){ newWidth = screen.availWidth; }
	if( newWidth == 'half' ){ newWidth = screen.availWidth/2; }
	if( newHeight == 'max' ){ newHeight = screen.availHeight; }
	if( newHeight == 'half' ){ newHeight = screen.availHeight/2; }

// 	alert( newHeight );

	var newWin = window.open( url , "_blank", "toolbar=" + newToolbar + " ,width = " + newWidth + ", height = " + newHeight + ", left = " + ((screen.availWidth/2)-(newWidth/2)) + ", top = " + ((screen.availHeight/2)-(newHeight/2)) );
	newWin.focus();
}