JavaScript animation tutorials/Web sites

[Amir]

Could anyone point me to good Web site that explains how to use JavaScript
for animations?

I'd like to see examples how to modify the STYLE parameters in the <DIV> tag
from a script.

Also, how I can generate <DIV> statements from JavaScript using
document.write("<DIV ...>") method, while supplying the <DIV> parameters,
for instance "left:100pix", by JavaScript variables.

Thank you!