ASP.Net and different browsers

[Bart Schelkens]

Hi,

I have this webapplication (www.polytools.be).
On this site I use the treeview from the webcontrols.
In my Internet Explorer everything works fine.
But when I want to open the site in Mozilla or Firefox, i get the following
error :

Specified argument was out of the range of valid values. Parameter name:
value

Here is the complete message, I hope I can get some help here :

Server Error in '/' Application.
Specified argument was out of the range of valid values. Parameter name:
value
Description: An unhandled exception occurred during the execution of the
current web request. Please review the stack trace for more information
about the error and where it originated in the code.

Exception Details: System.ArgumentOutOfRangeException: Specified argument
was out of the range of valid values. Parameter name: value

Source Error:

An unhandled exception was generated during the execution of the current web
request. Information regarding the origin and location of the exception can
be identified using the exception stack trace below.

Stack Trace:

[ArgumentOutOfRangeException: Specified argument was out of the range of
valid values.
Parameter name: value]
System.Web.UI.WebControls.Unit.GetTypeFromString(S tring value) +332
System.Web.UI.WebControls.Unit..ctor(String value, CultureInfo culture,
UnitType defaultType) +292
System.Web.UI.WebControls.FontUnit..ctor(String value, CultureInfo
culture) +584
System.Web.UI.WebControls.FontUnit..ctor(String value) +52
Microsoft.Web.UI.WebControls.CssCollection.GetFont Size() +50
Microsoft.Web.UI.WebControls.CssCollection.RenderB eginFontTag(HtmlTextWriter
writer) +61
Microsoft.Web.UI.WebControls.TreeNode.RenderDownLe velPath(HtmlTextWriter
output) +3031
Microsoft.Web.UI.WebControls.BaseChildNode.Render( HtmlTextWriter writer,
RenderPathID pathID) +23
Microsoft.Web.UI.WebControls.TreeView.RenderConten ts(HtmlTextWriter
output) +371
Microsoft.Web.UI.WebControls.TreeView.RenderDownLe velPath(HtmlTextWriter
output) +169
Microsoft.Web.UI.WebControls.BaseRichControl.Rende r(HtmlTextWriter
writer) +39
System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +131
System.Web.UI.Control.RenderChildren(HtmlTextWrite r writer) +72
System.Web.UI.HtmlControls.HtmlForm.RenderChildren (HtmlTextWriter writer)
+44
System.Web.UI.HtmlControls.HtmlForm.Render(HtmlTex tWriter output) +262
System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +131
System.Web.UI.Control.RenderChildren(HtmlTextWrite r writer) +72
System.Web.UI.Control.Render(HtmlTextWriter writer) +7
System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +131
System.Web.UI.Page.ProcessRequestMain() +1926
Version Information: Microsoft .NET Framework Version:1.1.4322.2032; ASP.NET
Version:1.1.4322.2032