var windowHandle = null;
 var globalImage = null;
 var globalImageWidth = null;
 var globalImageHeight = null;
 var globalCaption = null;

function myOpen(localImage,localCaption,imageWidth,imageHeight){
     globalImage = localImage;
     globalCaption = localCaption;
     globalImageWidth = imageWidth;
     globalImageHeight = imageHeight;
	 windowWidth = imageWidth + 34;
	 if (imageHeight > screen.height - 140)		
	 	windowHeight = screen.height - 50
	 else
		windowHeight = imageHeight + 110;
	 posX = screen.width/2 - imageWidth/2 - 20;
     windowHandle = 
window.open('photo.html','windowName','toolbar=no,location=no,status=no, scrollbars=yes,resizable=no,width='+ windowWidth +',height='+ windowHeight +',top=0,left='+ posX );
windowHandle.moveTo(posX,0);
}

function changeIt(MyImage1, MyImage2) { 
if (document.images) { document[MyImage1].src = MyImage2; } 
} 

function displayNavigator(){
	var myText=null;
	myText ='Your browser is: ' + navigator.appName + '\n' + 'Version ';
	myText += navigator.appVersion + '\n';
	myText +='Your screen width is '+ screen.width+' pixels'+'\n';
	myText +='Colour depth is '+ screen.colorDepth+' bits';
	alert(myText);
	}