cannot get all data from all tabs

hi,

I am trying to send all data from my tabs to another page and get them all there, but I can get only data from first tab.
I am using
document.getElementsByTagName("input").item(0).getAttribute("value");
  thanks

I need to have one button for all tabs but my button works for first tab only.

var button1 = new AW.UI.Button;
    button1.setId("button1");
    button1.setControlText("OK");
            document.write(button1);
             button1.onClick = function(){
        showData();
    }