I ran into the same problem so i looked for a ajax validation to do this and since you dont have much programing skills i tried this one wich is very very easy to use, check the attachment file here, the only bad thing about this validation is that its client side and needs javascript enable to work.
Ok how to use:
Step 1
download the zip file validation1.5.4.1.zip or go to really-easy-field-validation and download the script it also explain there how to use, but ill explain here how i did it with webassist.
Ok
Step 2
Open the page that has the multiple insert form and in the head of the page look for this in code view and copy paste the scripts file before </head> tag
Should look like this:
<script src="scriptaculous/lib/prototype.js" type="text/javascript"></script>
<script src="scriptaculous/src/effects.js" type="text/javascript"></script>
<script type="text/javascript" src="fabtabulous.js"></script>
<script type="text/javascript" src="validation.js"></script>
<style>
input.disabled {
border: 1px solid #F2F2F2;
background-color: #F2F2F2;
}
input.required, textarea.required {
border: 1px solid #00A8E6;
}
input.validation-failed, textarea.validation-failed {
border: 1px solid #FF3300;
color : #FF3300;
}
input.validation-passed, textarea.validation-passed {
border: 1px solid #00CC00;
color : #000;
}
.validation-advice {
margin: 5px 0;
padding: 5px;
background-color: #FF3300;
color : #FFF;
font-weight: bold;
}
.custom-advice {
margin: 5px 0;
padding: 5px;
background-color: #C8AA00;
color : #FFF;
font-weight: bold;
}
fieldset {
padding: 1em;
margin-bottom: 0.5em;
}
label {
font-weight: bold;
}
.form-row {
clear: both;
padding: 0.5em;
}
.field-label {
}
.field-widget {
}
</style>
</head>
be sure where you placed the scripts files example of one
<script type="text/javascript" src="../folder/validation.js"></script>
the best thing you can do if you dont have much programing knowledge is to past all the scripts in the same folder where your multiple insert page is
Step 3
now after that go to each of the forms elements and add this at the end
Class="require" title="any text to require example please fill your name"
a better example would be like i did for this name field
<input type="text" name="Name_<?php echo $RepeatSelectionCounter_1; ?>" id="Name_<?php echo $RepeatSelectionCounter_1; ?>" value="" size="32" class="required" title="Your Name is required"/>
Step 4
now scroll down to the end of the form it should look like </form>
and add this script:
<script type="text/javascript">
var valid1 = new Validation('FORMNAME', {useTitles:true});
</script>
In that script i have FORMNAME just change it to the name your form has, to know how its named scroll up until you find the opening of the form tag something like:
<form action="your_insert_page.php" method="post" enctype="multipart/form-data" name="FORMNAME" id="FORMNAME">
Save your document and press F12 to test it out.
Hope this helps :D