/* Viewer controls */
function panLeft() 		{ document.ptviewer.panLeft(); }
function panRight() 	{ document.ptviewer.panRight(); }
function zoomIn() 		{ document.ptviewer.ZoomIn(); }
function zoomOut() 		{ document.ptviewer.ZoomOut(); }
function startAutoPan() { document.ptviewer.startAutoPan(0.3,0.0,1.0); }
function stopAutoPan() 	{ document.ptviewer.stopAutoPan(); }