var dorthin = null;
var w = 0;
var h = 0;
function middle(u,n,w,h,s) {
        if (window.screen) {
        var hori = screen.availWidth;
        var verti = screen.availHeight;
        dorthin = window.open(u,n,'width='+ w  +',height='+ h +',left='+((hori - w- 10)* .5) +',top='+((verti - h- 30)* .5) +',scrollbars='+ s)
dorthin.focus()
}
}

function external(u,n,w,h,s,l) {
        if (window.screen) {
        var hori = screen.availWidth;
        var verti = screen.availHeight;
        dorthin = window.open(u,n,'width='+ w  +',height='+ h +' ,left='+ l +' ,top= 0 ,scrollbars='+ s)
dorthin.focus()
}
}