Fix for bug 92949: Crash when non-numeric values are entered for Size

field on last screen (r=tao)

cck/cckwiz/iniFiles/build_page1.ini

@@ -187,7 +187,7 @@ Start_x=330
 Start_y=125
 Width=45
 Height=14
-onCommand=IsNumeric
+onCommand=IsNumeric(You must enter only numeric values)
 
 [Widget 10]
 Type=Text
@@ -253,7 +253,7 @@ Start_x=330
 Start_y=198
 Width=45
 Height=14
-onCommand=IsNumeric
+onCommand=IsNumeric(You must enter only numeric values)
 
 [Widget 869]
 Type=Text