Javascript

1.How can refresh the page using javascript?
<input type="button" value="Reload Page" onClick="window.location.reload()">

or
<input type="button" value="Reload Page" onClick="history.go(0)">

or

<input type="button" value="Reload Page" onClick="window.location.href=window.location.href">
or

http://www.mediacollege.com/internet/javascript/page/reload.html

2.Validation to file upload?


<script type="text/javascript">
function validateregister(frm){
     var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
    var prs_name = jQuery('#prs_name').val();
var prs_year = jQuery('#prs_year').val();
  var file = document.getElementById("prs_file").value;
   var thumb = document.getElementById("prs_thumbnail").value;
   
if(file==''){
        alert("Please enter  file");
                return false;
     
    }

if(thumb==''){
        alert("Please enter  Thumbnail");
                return false;
     
    }


    if(prs_name==''){
        alert("Please enter Title");
        jQuery('#prs_name').focus();
        return false;
    }
   
if(prs_year==''){
        alert("Please enter Date");
        jQuery('#prs_year').focus();
        return false;
    }

   
   
 
    if(prs_description==''){
        alert("Please enter  Description");
                return false;
     
    }
    }
</script>