function extdyn(eurl)
{
var lpos;
var hpos;
var w;
var h;
w=screen.width;
h=screen.height;
lpos=(screen.width)?(screen.width-w)/2:100;
hops=(screen.height)?(screen.height-h)/2:100;
var newWindow;
var props = 'scrollBars=yes,resizable=yes,toolbar=yes,menubar=yes,location=yes,directories=no,width=800,height=600,left='+lpos +',top='+hpos;
newWindow = window.open(eurl, "external_site", props);
}