[jQuery] Reinitialization of css values

Hello people!
I'm looking for a solution to put div properties to initial state.
Explanation :
$("div").toggle(function(){
$(this).animate({
width : "90%",
height : "90%",
left : "5%",
top : "5%"
},500);
},function(){
//Reinitialization of initial values which are
described in the CSS file
});
Thank you!