[jQuery] Div property

[jQuery] Div property

Hi all,
I use wrap for <img src="..." class="dropshadow">.
$(".dropshadow").wrap("<div class='wrap1'></div>");
.wrap1 css : Just float:left and background.
And, I want to change the margins dynamically...
I can use :
$(".wrap1").each(function(i) {
 And here, how to know width of div ? And modify <img>, <div>, etc...
});
Thank you,
Florian
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