diff --git a/mozilla/layout/generic/nsFrameSetFrame.cpp b/mozilla/layout/generic/nsFrameSetFrame.cpp
index d85a7bbeaa3..8c8f85a94a3 100644
--- a/mozilla/layout/generic/nsFrameSetFrame.cpp
+++ b/mozilla/layout/generic/nsFrameSetFrame.cpp
@@ -527,6 +527,8 @@ nsHTMLFramesetFrame::ParseRowColSpec(nsString& aSpec, PRInt32 aMaxNumValues,
   static const PRUnichar PERCENT('%');
   static const PRUnichar COMMA(',');
 
+  aSpec.Trim(" \n\r\t"); // remove leading and trailing whitespace  
+  
   // Count the commas 
   PRInt32 commaX = aSpec.Find(COMMA);
   PRInt32 count = 1;
diff --git a/mozilla/layout/html/document/src/nsFrameSetFrame.cpp b/mozilla/layout/html/document/src/nsFrameSetFrame.cpp
index d85a7bbeaa3..8c8f85a94a3 100644
--- a/mozilla/layout/html/document/src/nsFrameSetFrame.cpp
+++ b/mozilla/layout/html/document/src/nsFrameSetFrame.cpp
@@ -527,6 +527,8 @@ nsHTMLFramesetFrame::ParseRowColSpec(nsString& aSpec, PRInt32 aMaxNumValues,
   static const PRUnichar PERCENT('%');
   static const PRUnichar COMMA(',');
 
+  aSpec.Trim(" \n\r\t"); // remove leading and trailing whitespace  
+  
   // Count the commas 
   PRInt32 commaX = aSpec.Find(COMMA);
   PRInt32 count = 1;