//Cache control

function pop(ref,titre,w,h)
{  
var ns4 = (document.layers)? true:false; 
  //NS 4
var ie4 = (document.all)? true:false;
  //IE 4
var dom = (document.getElementById)? true:false;
  //DOM
var xMax, yMax, xOffset, yOffset;;
  
    if (ie4 || dom)
        {
        xMax = screen.width;
        yMax = screen.height;
        }
    else if (ns4)
        {
        xMax = window.outerWidth;
        yMax = window.outerHeight;
        }
    else
        {
        xMax = 800;
        yMax = 600;
        }
    xOffset = (xMax - MyWidth)/2;
    yOffset = (yMax - MyHeight)/2; 
 window.open(ref,titre,'width='+w
+',height='+h
+',screenX='+xOffset
+',screenY='+yOffset
+',top='+yOffset
+',left='+xOffset
+',scrollbars=yes,resizable=yes');
}