I'm trying to call a javascript function and its not working. I click, but nothing appears to happen. Any help is appreciated

Code:
<body>

<script>
var brushVar;


function blue() {
    brushVar = ("#000000");
    alert(brushVar);
}

function blueN() {
    brushVar = ("#000000");
    alert(brushVar);
}

function cyan() {
    brushVar = ("#000000");
    alert(brushVar);
}

function cyanN() {
    brushVar = ("#000000");
    alert(brushVar);
}

function green() {
    brushVar = ("#000000");
    alert(brushVar);
}

function greenN() {
    brushVar = ("#000000");
    alert(brushVar);
}

function purple() {
    brushVar = ("#000000");
    alert(brushVar);
}

function purpleN() {
    brushVar = ("#000000");
    alert(brushVar);
}

function red() {
    brushVar = ("000000");
    alert(brushVar);
}

function redN() {
    brushVar = ("000000");
    alert(brushVar);
}

function yellow() {
    brushVar = ("#000000");
    alert(brushVar);
}

function yellowN() {
    brushVar = ("#000000");
    alert(brushVar);
}
</script>





<div id="buttons" style="position:absolute; width:100%; height:100%>
 <a href="#" onclick="blue()';" >
    <img src="/blue.png"/>
</a>
<a href="#" onclick="blueN()';" >
    <img src="blueN.png"/>
</a>
<a href="#" onclick="cyan()';" >
    <img src="cyan.png"/>
</a>
<a href="#" onclick="cyanN()';" >
    <img src="cyanN.png"/>
</a>
<a href="#" onclick="green()';" >
    <img src="green.png"/>
</a><a href="#" onclick="greenN()';" >
    <img src="greenN.png"/>
</a>
<a href="#" onclick="purple()';" >
    <img src="purple.png"/>
</a>
<a href="#" onclick="purpleN()';" >
    <img src="purpleN.png"/>
</a>
<a href="#" onclick="red()';" >
    <img src="red.png"/>
</a>
<a href="#" onclick="redN()';" >
    <img src="redN.png"/>
</a>
<a href="#" onclick="yellow()';" >
    <img src="yellow.png"/>
</a>
<a href="#" onclick="yellowN()';" >
    <img src="yellowN.png"/>
</a>
</div>
</body>