Question about Launching apps from Web

Hi, everyone, I am new to this Basic4Android. I wrote an application and use web to launch it. It works on the emulator 2.33 and Dolphine web browser but not on HTC Evo Webkit web browser [Android Version 2.35]. I am not sure why. Any help is greatly appreciated.

Manifest:

AddManifestText(
<uses-sdk android:minSdkVersion="4" />
<supports-screens android:largeScreens="true"
android:normalScreens="true"
android:smallScreens="true"
android:anyDensity="true"/>)
SetApplicationAttribute(android:icon, "@drawable/icon")
SetApplicationAttribute(android:label, "$LABEL$")
AddActivityText(main,
<intent-filter>
<data android:scheme="my.cameraapp.scheme" />
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.DEFAULT" />
<category android:name="android.intent.category.BROWSABLE"/>
</intent-filter>
)

----------------------------------------
From the web page:

<a href="my.cameraapp.scheme://key1/key2")>
<asp:Label ID="lblink"
runat ="server"
Text ="Launch My Camera-my.cameraapp.scheme:"
Font-Bold ="true"
Font-Size ="18px" />

Thanks.