How to restrict a floating menu

[elusified]

Hi guys, i am now doin this website that required a floating menu. the problem is how do i restrict the floating menu to prevent it from goin out of the navigation area when the window is minimize? below are my codes.

var verticalpos="fr ombottom"

if (!document.laye rs)
document.write( '</div>')

function JSFX_FloatTopDi v()
{
var startX = 75,
startY = 420;
var ns = (navigator.appN ame.indexOf("Ne tscape") != -1);
var d = document;
function ml(id)
{
var el=d.getElement ById?d.getEleme ntById(id):d.al l?d.all[id]:d.layers[id];
if(d.layers)el. style=el;
el.sP=function( x,y){this.style .left=x;this.st yle.top=y;};
el.x = startX;
if (verticalpos==" fromtop")
el.y = startY;
else{
el.y = ns ? pageYOffset + innerHeight : document.body.s crollTop + document.body.c lientHeight;
el.y -= startY;
}
return el;
}
window.stayTopL eft=function()
{
if (verticalpos==" fromtop"){
var pY = ns ? pageYOffset : document.body.s crollTop;
ftlObj.y += (pY + startY - ftlObj.y)/8;
}
else{
var pY = ns ? pageYOffset + innerHeight : document.body.s crollTop + document.body.c lientHeight;
ftlObj.y += (pY - startY - ftlObj.y)/8 ;
}
ftlObj.sP(ftlOb j.x, ftlObj.y);
setTimeout("sta yTopLeft()", 10);
}
ftlObj = ml("divStayTopL eft");
stayTopLeft();
}
JSFX_FloatTopDi v();
</script>

[drhowarddrfine]

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