how to remove number one by one in the calculator text box using JavaScript?

[dev saini]

how to remove number one by one in the calculator text box using JavaScript. its urgent

[gits]

please provide more information - what calculator? what box ... probably you should provide a snippet of code ... so that a reader could follow that issue ...

[Bharat383]

html:

<form>
			<input type="text" name="display_screen" value="" id="display_screen" />
			<br />			
			<input type="button" name="btn_1" value="1" onclick="add_value(this.value)"/>
			<input type="button" name="btn_2" value="2"  onclick="add_value(this.value)"/>	
			<input type="button" name="btn_3" value="3"  onclick="add_value(this.value)"/>
			<br />
			<input type="button" name="btn_4" value="4"  onclick="add_value(this.value)"/>
			<input type="button" name="btn_5" value="5"  onclick="add_value(this.value)"/>
			<input type="button" name="btn_6" value="6"  onclick="add_value(this.value)"/>
			<br />
			<input type="button" name="btn_7" value="7"  onclick="add_value(this.value)"/>
			<input type="button" name="btn_8" value="8"  onclick="add_value(this.value)"/>
			<input type="button" name="btn_9" value="9"  onclick="add_value(this.value)"/>
			<br />
			<input type="button" name="btn_10" value="0"  onclick="add_value(this.value)"/>
			<input type="button" name="btn_12" value="."  onclick="add_value(this.value)"/>
			<input type="button" name="btn_11" value="00"  onclick="add_value(this.value)"/>
			<br />
			<input type="submit" name="submit" value="SUBMIT" />
			<input type="reset" name="reset" value="CLEAR" />					
	</form>

javascript

	<script type="text/javascript">
		function add_value(tmp)
		{
				document.getElementById("display_screen").value =document.getElementById("display_screen").value + tmp; 		
		}
	</script>