JSFiddle - React, Tailwind, and code Playground

HTML

<img src="http://cs5947.vkontakte.ru/u17024909/e_95a2680e.jpg" name="tigr" width="102" >

JavaScript

var img = document.tigr;

img.onmouseover=bigPict; 
img.onmouseout=litlePict;

function bigPict(){
    if (img.width<302){
        img.width += 10;
        setTimeout( bigPict, 10);
    }
}

function litlePict(){
    if (img.width>102){
        img.width -= 5;
        setTimeout( litlePict, 1);
    }
}