// overly simplistic test for IE
isIE = (document.all ? true : false);
// both IE5 and NS6 are DOM-compliant (well, sort of...)
isDOM = (document.getElementById ? true : false);

// get the true offset of anything on NS4, IE4/5 & NS6, even if it's in a table!
function getAbsX(elt) { return (elt.x) ? elt.x : getAbsPos(elt,"Left"); }
function getAbsY(elt) { return (elt.y) ? elt.y : getAbsPos(elt,"Top"); }
function getAbsPos(elt,which) {
iPos = 0;
while (elt != null) {
 iPos += elt["offset" + which];
 elt = elt.offsetParent;
}
return iPos;
}

function getDivStyle(divname) {
var style;
if (isDOM) { style = document.getElementById(divname).style; }
else { style = isIE ? document.all[divname].style
                    : document.layers[divname]; } // NS4
return style;
}

function hideElement(divname) {
getDivStyle(divname).visibility = 'hidden';
}

// annoying detail: IE and NS6 store elt.top and elt.left as strings.
function moveBy(elt,deltaX,deltaY) {
elt.left = parseInt(elt.left) + deltaX;
elt.top = parseInt(elt.top) + deltaY;
}

function toggleVisible(divname) {
divstyle = getDivStyle(divname);
if (divstyle.visibility == 'visible' || divstyle.visibility == 'show') {
  divstyle.visibility = 'hidden';
} else {
  fixPosition(divname);
  divstyle.visibility = 'visible';
}
}

function setPosition(elt,positionername,isPlacedUnder) {
var positioner;
if (isIE) {
 positioner = document.all[positionername];
} else {
 if (isDOM) {
   positioner = document.getElementById(positionername);
 } else {
   // not IE, not DOM (probably NS4)
   // if the positioner is inside a netscape4 layer this will *not* find it.
   // I should write a finder function which will recurse through all layers
   // until it finds the named image...
   positioner = document.images[positionername];
 }
}
elt.left = getAbsX(positioner);
elt.top = getAbsY(positioner) + (isPlacedUnder ? positioner.height : 0);
}

function setPositionXY(elt,positionername,OffsetX, OffsetY) {
var positioner;
if (isIE) {
 positioner = document.all[positionername];
} else {
 if (isDOM) {
   positioner = document.getElementById(positionername);
 } else {
   // not IE, not DOM (probably NS4)
   // if the positioner is inside a netscape4 layer this will *not* find it.
   // I should write a finder function which will recurse through all layers
   // until it finds the named image...
   positioner = document.images[positionername];
 }
}
elt.left = getAbsX(positioner) + OffsetX;
elt.top = getAbsY(positioner) + OffsetY;
}