JQuery :: Updating A Table Whit $.post ?

I've 2 little problems in my page....i've already done the functional script in php for erasing and inserting a row into a table...but i've a problem...this row contains 2 links that are for erasing and modifying the row.... it happen that when i insert a row (that has class="edit" and it's for working on ajax...) i can erase and modify only the old rows and not the new ones...probably cause javascript takes all the element of a general class only at the loading of the page and link them to the onclick function....

I post the code here...

The html+php table

And when i insert a row into the db i update the table with this script

Where the data appended to the table is a row of the table given from the php script

Another thing,as you can see, is that i would like to know how to pop up a new alert if data from the last function on the $.post is equal to a string

I tried to do it with the compareto js function but it didn't seem to work....