Untitled

<!DOCTYPE html> <html> <head> <script>
window.onload = init;

var clicks = 0;

function init()
{
document.getElementById("go").onclick = add_textarea;
}

function add_textarea()
{
clicks++;
var textarea = '';
for(var i=0;i<clicks;i++)
{
textarea += '<textarea cols="5" rows="5"></textarea><br>';
}
document.getElementById("pola").innerHTML = textarea;

}
</script> </head>
<body>

<form action="#"> <input type="submit" value="Dodaj pole" id="go"/> </form>

<div id="pola"></div>

</body> </html>