displayin output using text box / similar

suppose, there is a button, and i want that on click the button some value should be displayed in a text box. is it possible?
or is there any possible way to display the output on the same page.

i have used document.write and it displays result on another page. plz help

Suppose there is one form containing one text box and button. On Click of the button call Javascript method to display text in the input box on the same page.

<form id="frm" name="frm" method="post" target="test.html">
<input type="text" value="" id="txt" name="txt" />
<input type="button" value="click" on-click="call();" />
</form>

The following is the Javascript method used to display text in input box.

function call()
{
document.getElementById('txt').value="hi!!";
}

i hope it might solve your problem...