a ver asi:
Código PHP:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<script type="text/javascript">
function asdf(v)
{
if (v==1) document.getElementById('f1').onsubmit = validar1;
else if (v==2) document.getElementById('f1').onsubmit = validar2
else if (v==3) document.getElementById('f1').onsubmit = validar3
else if (v==4) document.getElementById('f1').onsubmit = validar4
}
function validar1()
{
if (hay algo mal) return false;
return true;
}
function validar2()
{
if (hay algo mal) return false;
return true;
}
function validar3()
{
if (hay algo mal) return false;
return true;
}
function validar4()
{
if (hay algo mal) return false;
return true;
}
</script>
</head>
<body>
<form id="f1" method="post" action="">
<input type="submit" value="enviar 1" onclick="asdf(1)">
<input type="submit" value="enviar 2" onclick="asdf(2)">
<input type="submit" value="enviar 3" onclick="asdf(3)">
<input type="submit" value="enviar 4" onclick="asdf(4)">
</form>
</body>
</html>