BISERVER-10075 - ReportViewer:  when entering an invalid page number, the warning UI looks terrible

What was done:
1) changed styles for diplaying error
BISERVER-10075 - ReportViewer:  when entering an invalid page number, the warning UI looks terrible

What was done:
1) added a new connector image
2) changed css to use the arrow
Merge pull request #70 from kolinus/BISERVER-10075

Biserver 10075 - ReportViewer:  when entering an invalid page number, the warning UI looks terrible