Prova cosi:
codice:
<script> 
var jq=jQuery.noConflict(); 
jq(document).ready(function(){ 
jq("img.c").each(function(){
jq(this).mouseout(function(){ 
jq(this).animate({height:300},"slow"); 
jq(this).animate({widht:300},"slow"); 
});
}); 
});
</script>