Java Script

[Dayo]

hi i need a java script for this form

<table width="400" border="1" cellpadding="0" cellspacing="0" bordercolor="#999999" bgcolor="#FFFFFF">
<tr>
<td><table width="100%" border="0">
<tr>
<td width="56%"><div align="left"><strong><span class="style16">Name<span class="style17">*</span> </span></strong></div></td>
<td width="44%"><input name="name" type="text" disabled id="name" value="<?php echo $_SESSION['SESS_FIRST_NAME']; ?> <?php echo $_SESSION['SESS_LAST_NAME']; ?>" size="25" /></td>
</tr>
<tr>
<td><div align="left"><strong><span class="style16">User Name and UserID<span class="style17">*</span></span></strong></div></td>
<td><span class="style16">
<input name="username" type="text" id="username" size="15" />
<input name="id" type="text" id="id" size="5" />
</span></td>
</tr>
<tr>
<td><div align="left"><strong><span class="style16">Email<span class="style17">*</span></span></strong></div></td>
<td><input name="email" type="text" id="email" size="25" /></td>
</tr>
<tr>
<td><div align="left"><strong><span class="style16">Phone Number<span class="style17">*</span></span></strong></div></td>
<td><input name="phone" type="text" id="phone" size="25" /></td>
</tr>
<tr>
<td><div align="left"><strong><span class="style16">Enquiry<span class="style17">*</span></span></strong></div></td>
<td><span class="style16">
<select name="Enquiry" id="Enquiry">
<option selected="selected">Select One</option>
<option>-------------------------</option>
<option value="support">Support</option>
<option>-------------------------</option>
<option value="web design">Web Design</option>
<option value="graphic design">Graphic Design</option>
<option>-------------------------</option>
<option value="feedback">Feedback</option>
<option value="complain">Complain</option>
<option>-------------------------</option>
<option value="error">Report Error</option>
</select>
</span> </td>
</tr>
<tr>
<td><div align="left"><span class="style16"><strong>Issue<span class="style17">*</span></strong></span></div></td>
<td><textarea name="issue" rows="3" id="issue"></textarea></td>
</tr>
<tr>
<td><div align="left"><strong><span class="style16">How you liked to be contacted <span class="style17">*</span></span></strong></div></td>
<td><span class="style16">
<input name="CPhone" type="radio" value="Yes" />
Phone
<input name="CEmail" type="radio" value="Yes" />
E-Mail</span></td>
</tr>
<tr>
<td colspan="2"><div align="center">
<input type="submit" name="Submit" value="Send" />
<input type="reset" name="Reset" value="Reset" />
<strong><span class="style16"></span></strong><br />
</div></td>
</tr>
<tr>
<td colspan="2"><div align="right" class="style22"><strong><span class="style16"><span class="style17"><em>*</em></span></span></strong><span class="style24"> Required </span></div></td>
</tr>
</table></td>
</tr>
</table>

what i want it to do is if they havent put in a feild a pop up will apear saying you havent put your details in this feild and once they have put all there details it lets them send the message

[Dayo]

dont worry i did it in PHP