I just spent the last 25 minutes building this for you in pure CSS3: http://jsfiddle.net/X8M5T/3/
You can always formulate a javascript function that will generate the HTML and CSS with the correct calculations so that you can easily change the dimensions of the triangles.
<style type="text/css">
.t {
top:55px;
left:5px;
}
.t div {
position:absolute;
width: 0px;
height: 0px;
border-style: solid;
border-width: 0 100px 173.2px 100px;
border-color: transparent transparent #0079c5 transparent;
transition:all 1s;
-webkit-transition:all 1s;
-moz-transition:all 1s;
cursor:pointer;
transform-origin:200px 173px;
-webkit-transform-origin:200px 173px;
-moz-transform-origin:200px 173px;
z-index:10;
}
.t div:hover {
z-index:20;
border-color: transparent transparent #009cff transparent;
}
.t div:nth-child(1) {
transform:rotate(30deg);
-webkit-transform:rotate(30deg);
-moz-transform:rotate(30deg);
}
.t div:nth-child(1):hover {
transform:rotate(30deg) translate(-15%, -10%);
-webkit-transform:rotate(30deg) translate(-15%, -10%);
-moz-transform:rotate(30deg) translate(-15%, -10%);
}
.t div:nth-child(2) {
transform:rotate(90deg);
-webkit-transform:rotate(90deg);
-moz-transform:rotate(90deg);
}
.t div:nth-child(2):hover {
transform:rotate(90deg) translate(-15%, -10%);
-webkit-transform:rotate(90deg) translate(-15%, -10%);
-moz-transform:rotate(90deg) translate(-15%, -10%);
}
.t div:nth-child(3) {
transform:rotate(150deg);
-webkit-transform:rotate(150deg);
-moz-transform:rotate(150deg);
}
.t div:nth-child(3):hover {
transform:rotate(150deg) translate(-15%, -10%);
-webkit-transform:rotate(150deg) translate(-15%, -10%);
-moz-transform:rotate(150deg) translate(-15%, -10%);
}
.t div:nth-child(4) {
transform:rotate(-30deg);
-webkit-transform:rotate(-30deg);
-moz-transform:rotate(-30deg);
}
.t div:nth-child(4):hover {
transform:rotate(-30deg) translate(-15%, -10%);
-webkit-transform:rotate(-30deg) translate(-15%, -10%);
-moz-transform:rotate(-30deg) translate(-15%, -10%);
}
.t div:nth-child(5) {
transform:rotate(-90deg);
-webkit-transform:rotate(-90deg);
-moz-transform:rotate(-90deg);
}
.t div:nth-child(5):hover {
transform:rotate(-90deg) translate(-15%, -10%);
-webkit-transform:rotate(-90deg) translate(-15%, -10%);
-moz-transform:rotate(-90deg) translate(-15%, -10%);
}
.t div:nth-child(6) {
transform:rotate(-150deg);
-webkit-transform:rotate(-150deg);
-moz-transform:rotate(-150deg);
}
.t div:nth-child(6):hover {
transform:rotate(-150deg) translate(-15%, -10%);
-webkit-transform:rotate(-150deg) translate(-15%, -10%);
-moz-transform:rotate(-150deg) translate(-15%, -10%);
}
</style>
<div class="t">
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
</div>