mi da errore ti posto il codice se ci puoi dare un okkio al volo

codice:
<html>
<head>
<script type="text/javascript">
function camcol(color1, cc) 
{ 
cc.style.backgroundColor = color1; 
} 
</script>>
</head>

<body> 



This example demonstrates how to change the background color of an input field.</p>


Mouse over the three colored table cells, and the input field will change background-color:</p>

<table width="100%"><tr>

</tr></table>

<form>
<input type="text" id="x" name="xn" onfocus="changeColor('aqua',this.id); camcol('aqua',this);"onBlur="changeColor('white',this.Name); camcol('white',this)"size="20">

<input type="text" id="y" name="yn" onfocus="changeColor('aqua',this.id); camcol('aqua',this);"onBlur="changeColor('white',this.Name); camcol('white',this)"size="20">

<input type="text" id="z" name="zn" onfocus="changeColor('aqua',this.id); camcol('aqua',this);"onBlur="changeColor('white',this.Name); camcol('white',this)"size="20">
</form>

</body>
</html>