Hola... tanto en local como on line en IE7 si agregas a sitios de confianza internet y extranet si funciona con este codigo:
Código HTML:
<script type="text/javascript">
function MM_swapImgRestore() { //v3.0
var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}
function MM_swapImage() { //v3.0
var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}
</script>
<form action="<?php echo $editFormAction; ?>" method="post" name="form1" id="form1">
<input name="form_data" type="file" class="botonera" id="img12" onBlur="LimitAttach(this,1);" onChange="MM_swapImage('previo1','',document.form2.form_data.src='file:///' + this.value,1)">
</form> en cambio en firefox 2 no va...