function addFileUploadBox()
{
    if (!document.getElementById || !document.createElement)
        return false;
    var uploadArea = document.getElementById ("upload-area");

    if (!uploadArea)
        return;

    var newUploadBox = document.createElement ("input");
    var newButton = document.createElement ("input");
    newUploadBox.type = "file";
    newButton.type="button";
    if (!addFileUploadBox.lastAssignedId)
        addFileUploadBox.lastAssignedId =  1 ;
    addFileUploadBox.lastAssignedId++;  	    

    var newLine = document.createElement ("br");
    uploadArea.appendChild (newLine);
    newLine.id='br_'+ addFileUploadBox.lastAssignedId; 
    
    newUploadBox.setAttribute ("id", "file_" + addFileUploadBox.lastAssignedId);
    newUploadBox.attachEvent('onchange', addFileUploadBox);
    uploadArea.appendChild (newUploadBox);
    
    newButton.value="удалить";
    newButton.onclick=DeleteField; 
    newButton.id='button_'+addFileUploadBox.lastAssignedId; 
    newButton.Name='buton_'+addFileUploadBox.lastAssignedId; 
    uploadArea.appendChild (newButton);
}

function DeleteField() 
{ 
var ar = this.id.split('_'); 
var o = ar[ 1 ]; 
var tempobj=document.getElementById('upload-area'); 
if (tempobj) 
{ 
var obj; 
obj = document.getElementById('file_'+o); 
if (obj)
 {tempobj.removeChild(obj);}; 
obj = document.getElementById('button_'+o); 
if (obj) 
{tempobj.removeChild(obj);}; 
obj = document.getElementById('br_'+o); 
if (obj) 
{tempobj.removeChild(obj);}; 
} 
}