Help js return nan as result

hi to all i am trying to make lil js calculator but i all time get nan result ?
Try no 1?

[CODE]<div class=”calculator”> <!–calculator test–>
<div id =a><?php echo $Data->var_price1; ?></div>
<div id =c><?php echo $Data->var_price2; ?></div>
<input id=”odrasli” type=”number”>
<input id=”deca” type=”number”>
<input type=”button” value=”Get Price” onClick=”mycalculator()”>
<script>
function mycalculator() {
var a = document.getElementById(“a”);
var x = document.getElementById(“odrasli”);
var c = document.getElementById(“c”);
var y = document.getElementById(“deca”);
var aa = a * x;
var cc = c * y;
var p = aa + cc;
var d = p * 0.2;
document.getElementById(“price”).innerHTML = p;
document.getElementById(“depozit”).innerHTML = d;
}
</script>
</p> Grand total </br><p id=”price”> </br>
Deposite<p id=”depozit”></p> </br>

</div>[/CODE]

Try no 2 still nan

[CODE]<div class=”calculator”> <!–calculator test–>
<div id =a><?php echo $Data->var_price1; ?></div>
<div id =c><?php echo $Data->var_price2; ?></div>
<input id=”odrasli” type=”number”>
<input id=”deca” type=”number”>
<input type=”button” value=”Get Price” onClick=”mycalculator()”>
<script>
function mycalculator() {
var a = document.getElementById(“a”);
var x = document.getElementById(“odrasli”);
var c = document.getElementById(“c”);
var y = document.getElementById(“deca”);
var aa = a * x;
var cc = c * y;
var p = aa + cc;
var d = p * 0.2;
document.getElementById(“price”).innerHTML = p;
document.getElementById(“depozit”).innerHTML = d;
}
</script>
</p> Grand total </br><p id=”price”> </br>
Deposite<p id=”depozit”></p> </br>

</div>[/CODE]

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