I'm new to HTML and i need feedback on something, Trying to switch images on button click but so when u click it again i Options

[fllwxDumbian]

<script>
function aclick()
{
var xy;
var xy = 0;
if (xy === 0) {
document.getElementById('abc')
.src="D:\\FLoW Dumbian\\pics\\healer.png";
var xy;
var xy = 1;
}
else if (xy === 1) {
document.getElementById('abc')
.src="D:\\FLoW Dumbian\\pics\\electrician.png";
var xy;
var xy = 0;
}
}
</script>