//------------------- DEFINE PARAMETERS ----------------------------------------
// -- work out available screen size
screenH = window.screen.availHeight;
screenW = window.screen.availWidth;
//- set up parameters of pop-up (width, height, position)
winW = 550;
winH = 450;
//-- set up left and top position for window to ensure center of screen
posLeft = (screenW/2) - (winW/2);
posTop = (screenH/2) - (winH/2);
//-- define the width and height of the users window
fullWinH= screenH;
fullWinW= screenW;
winParam = "";
//------------------------------------------------------------------------------
//-- function: - open an image in a sized window with no furniture
// - writes html to the window to display an image.
// - image displayed with a custom close button at head
//-- sTitle: title to be displayed in window title bar
//-- imageName: name / path of image to be displayed in window, including extension
//-- wW: width of new window (if no value then default value is taken)
//-- wH: height of new window (if no value then default value is taken)
function openGWin(sTitle,imageName,wW,wH){
//-- if no values passed set width and height to default values
if(wW == 0){wW = winW;}
if(wH == 0){wH = winH;}
//-- set top and left attributes
posLeft = (screenW/2) - (wW/2);
posTop = (screenH/2) - (wH/2);
winLayout = "" + sTitle + "
![](http://www.flowersbyelaine.co.uk/images/" + imageName + ")