multiplying two dropdown menu values
Hi I am pretty new to Japascript, and have been trying to multiply the values of two dropdown menus
<td><form action="index.php?c=ref">
<select id="RLA" name="RLA" size="1" onchange="totalA(this.value);" >
<option value="">...</option>
<option value="10">10</option>
<option value="20">20</option>
<option value="30">30</option>
<option value="40">40</option>
</select>
<select id="RLB" name="RLB" size="1" onchange="totalB(this.value);">
<option value="">Choose One...</option>
<option value="0.55">x4 @ $0.55 each</option>
<option value="1.00">x8 @ $1.00</option>
<option value="1.30">x13 @ $1.30</option>
</select>
<input type="button" class="butt2" value="Buy Now" />
</form></td>
<td>Total: <input id="show" name="show" type="text" value="$0.00" size="3" /></td>
The Javascript that is supposed to work with it is
var numA = 0;
function totalA(valA) {
if (valA && document.getElementById(valA)) {
numA = eval(valA);
}
}
var numB = 0;
function totalB(valB) {
if (valB && document.getElementById(valB)) {
numB = eval(valB);
}
}
var tots = "$" + (numA * numB);
document.write("show").value = "$" + tots;
I have searched the web, exhausted my brain and am ready to have an aneurysm.
Basically I am trying to show the value of the selected two options before purchase.
Can someone help me?