adding slides

<img src="test1.gif" region="textregion" begin="0min" end=".1min"/>
<img src="test2.gif" region="textregion" begin=".10min" end=".2min"/>
<img src="test3.gif" region="textregion" begin=".2min" end=".3min"/>
<img src="test4.gif" region="textregion" begin=".3min" end=".4min"/>

next slide