var displayWidth = screen.width;
var displayHeight = screen.height;

function photoopen(num){
	var winWidth = displayWidth * 0.83;
	var winHeight = displayHeight * 0.90;
	var optionString = 'width=' +winWidth+ ',height=' +winHeight+ ',top=18,left=96,resizable=yes,scrollbars=yes';
	
	myHTML = 'pg'+num+'.html';
	window.open(myHTML ,'thumbs',optionString);
}