Capture HTML tag value to smarty

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HTML

PHP

form

Im not so good in smarty so I need help,

When I submit  this form using ajax : 


    <form accept-charset="UTF-8" method="post" onSubmit="return validate()">
			<input type="text" name="code" maxlength="15" class="input-text" id="code" value="" placeholder="code">
			<input type="submit" class="button-alt-gray top1px" name="code" value="Apply" onClick="search_code()"> <br>
			</form>


			<div id="cool_number" />
 
this `<div id="cool_number" />`  gives me (prints on screen)  a value lets say 10 

and I want to pass or capture this value to a an smarty tag , I tried this:

does not work

    {$p.total = "<div id="cool_number" />"}

does not work 

    {$p.total = "<div id='cool_number' />"}

does not work 

    {$p.total = "<div id=\"cool_number\" />\n"}

What I have tried:

I tried this:

does not work

{$p.total = "<div id="cool_number" />"}

does not work

{$p.total = "<div id='cool_number' />"}

does not work

{$p.total = "<div id=\"cool_number\" />\n"}