les muestro un codigo de ejemplo

delphi
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <!--<script src="Jquery.js" type="text/javascript"></script>--> <title>Documento sin título</title> <script> var contLin = 3; function agregar() { var tr, td, tabla; tabla = document.getElementById('tabla'); tr = tabla.insertRow(tabla.rows.length); td = tr.insertCell(tr.cells.length); td.innerHTML = "<input name='button' type=button onclick='agregar()' value='+' >"; td = tr.insertCell(tr.cells.length); td.innerHTML = "<input name='button' type=button onclick='borrarUltima()' value='-' >"; td = tr.insertCell(tr.cells.length); td.innerHTML = "<input type='text' value='' size='4' >"; td = tr.insertCell(tr.cells.length); td.innerHTML = "<input type='text' value='' size='10' >"; td = tr.insertCell(tr.cells.length); td.innerHTML = "<input type='text' value='' size='30' >"; td = tr.insertCell(tr.cells.length); td.innerHTML = "<input type='text' value='' size='4' >"; td = tr.insertCell(tr.cells.length); td.innerHTML = "<input type='text' value='' size='4' >"; td = tr.insertCell(tr.cells.length); td.innerHTML = "<input type='text' value='' size='4' >"; td = tr.insertCell(tr.cells.length); td.innerHTML = "<input type='text' value='' size='4' >"; td = tr.insertCell(tr.cells.length); td.innerHTML = "<img src='imagenes_menu/untitled.png' width='20' height='20' style='cursor:pointer' />"; contLin++; } function borrarUltima() { ultima = document.all.tabla.rows.length - 1; if(ultima > -1){ document.all.tabla.deleteRow(ultima); contLin--; } } </script> </head> <body> <div class="factura" id="factura"> <table id="tabla" border="1"> <tr class="cab_factura"> <td class="enlace10"></td> <td class="enlace10"></td> <td class="enlace10">Almacén</td> <td class="enlace10">Referencia</td> <td class="enlace10">Descripción</td> <td class="enlace10">Cantidad</td> <td class="enlace10">Precio</td> <td class="enlace10">%Dto.</td> <td class="enlace10">Total Albaran</td> <td class="enlace10"></td> </tr> <tr> <td ><input name="button" type=button onclick="agregar()" value="+" ></td> <td ><input name="button" type=button onclick="borrarUltima()" value="-" ></td> <td ><input name="almacen" id="sel1" type="text" size="4" /></td> <td><input name="referencia" type="text" size="10" /></td> <td><input name="descripcion" type="text" size="30" /></td> <td><input name="cantidad" type="text" size="4" /></td> <td><input name="precio" type="text" size="4" /></td> <td><input name="descuento" type="text" size="4" /></td> <td><input name="total" type="text" size="4" /></td> <td><img src="imagenes_menu/untitled.png" width="20" height="20" style="cursor:pointer" /></td> </tr> </table> </body> </div> </html>
por favor su ayuda.
Saludos