Untitled

<html>
<head><title> Ejemplo de los eventos onMouseDown y on MouseUp</title>
<script language=JavaScript>
function myButton_onmouseup() {
   document.form1.myButton.src = "img/arriba.png"
}

function myButton_onmousedown() {
   document.form1.myButton.src = "img/arriba1.png"

}
</script>
</head>
<body>

<FORM NAME=form1>
   <img id="capa2"  NAME='myButton' class="img-circle" src="img/arriba.png" alt="Foto de AGUILA RUIZ"
   onmouseup="myButton_onmouseup()"
   onmousedown="myButton_onmousedown()">
</FORM>

</body>
</html>