Javascript/Browser problem

[Aeroblizz]

Hi,

Our programmer is having problems with a text-tool made with javascript.
His description is:

There is no function that don't work, what work in Firefox not work in Chrome

if ($.browser.webkit) {
this.setZoom();
};
line 269
if you will remove it (so no change of zoom), then you will see bug in Chrome
and line 265
if($.browser.mozilla && $.browser.version > 12) {
$('#workarea').css('overflow', 'hidden');
};
if you will remove it - you will see bug in Firefox

Does anyone recognize this problem?
If you think you can fix it, pm me your price.

[Aeroblizz]

this.toEditMode = function(obj) {
this.setVars(obj);
if($.browser.mozilla && $.browser.version > 12) {
$('#workarea').css('overflow', 'hidden');
};
$(curbody).enableSelection();
if ($.browser.webkit) {
this.setZoom();
};
editmode = true;
selected = true;
$(curbody).css('cursor', 'auto');
curbody.contentEditable = "true";
$(curbody).attr('contenteditable', 'true');
curframe.contentWindow.document.contentEditable=true;
curframe.contentWindow.document.designMode="on";
curbody.contentEditable=true;
curbody.designMode="on";
svgCanvas.setEnhtextMode('edit');
this.refreshWindow();
};