<script language="JavaScript">
<!--
//http://www.alsaher.net

function backbs(clr) {
document.bgColor = clr
}

//-->
</script>
<form>
<input type="button" value="ازرق فاتح" onclick="backbs('aqua')"> 

<input type="button" value="اصفر" onclick="backbs('yellow')"> 

<input type="button" value="ككاوي" onclicke="backbs('khaki')"> 

<input type="button" value="ابيض" onclick="backbs('white')"> 

<input type="button" value="رصاصي" onclick="backbs('gray')">
</form>