How To Format Currency And Symbols

I don't really know javascript but I have one to display pricing in a dropdown. Here is what I have. What I would like to change is this.
Currently amounts 0.075 shows as ---> 0.075
4.9999 shows as ---> 4.99
0.1 shows as ---> 0.1
0.095 shows as ---> 0.095

I would like to get the above to show as follows:
0.075 shows as ---> 7.5
4.9999 shows as ---> $4.99
0.1 shows as ---> 10
0.095 shows as ---> 9.5

The first column (pricing data) is a standard format I cannot change so it must stay that way. Here is my code as it is now.
<script type="text/javascript">
function showrate(strValue){
var objLabel = document.getElementById("lblMessage");
if(objLabel.childNodes.length < 1) {
var objNodeValue = document.createTextNode(strValue);
objLabel.appendChild(objNodeValue); .....