var imageviewer;
var viewingimage;

maxWidth=790;
maxHeight=500;
LeftPosition = (screen.width) ? (screen.width-maxWidth)/2 : 0;
TopPosition = (screen.height) ? (screen.height-maxHeight)/2 : 0;

function open_window(url) {
	mywin = window.open(url,"_blank",'left='+LeftPosition+',top='+TopPosition+',toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=1,resizable=1,width='+maxWidth+',height='+maxHeight);
}
function open_URL(url) {
	mywin = window.open(url,"_blank");
}

function open_Image(imgsrc){
	//window.alert("showing : "+imgsrc);
	if (imageviewer && !imageviewer.closed) imageviewer.close		
	imageviewer = window.open('blowupimage.html',"ImageViewer",'left='+LeftPosition+',top='+TopPosition+',toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=1,resizable=1,width='+maxWidth+',height='+maxHeight);
	viewingimage = imgsrc;
}
function getImage(){ return viewingimage;}