Subsctipt and superscript

[gaya]

Hi,I want to do the button for subscript and superscript. For example now, when we r typing the question in this textarea, if we want to highlight the main text we r selecting the statement and we click the B for bold. Then our statement becomes like <b>.....</b> Like this i want to do for subscript and superscript. If i give X2 I want to do like X₂. Please tell me how to do this.

Edited February 28, 2013 by gaya

[gaya]

<button type="button" onclick="addtext();getfocus();">Subscript</button>function addtext() {var newtext = document.getElementById("ques1").value;newtext += prompt("enter the value",'<sub></sub>');document.getElementById("ques1").value = newtext;document.getElementById('ques1').focus();}

The above is my code. I did it for one textarea. But if i'm having another textarea and i want to include the subscript in that textarea only, How can i do this.Please tell me.

Edited March 1, 2013 by gaya

[ankit bhalodiya]

_text for subscript & <sup>text</text> for superscript