This was the original division:

after applying jquery cycle plugin the image gets out of its bottom border like this:

Any ideas why ?
Here is the css of the division:
#hero {
float: right;
border-top: 1px solid #FFF;
width: 725px;
height: 370px;
background: #666;
}
#wave {
width: 970px;
height: 40px;
position: absolute;
left: 0;
bottom: 0;
background: url(../img/wave.png) no-repeat bottom left;
}
The cycle plugin uses the z-index, that is likely the source for your problem. From the cycle plugin code:
I’d play with the z-index of the “wave” and see if that doesn’t help.