If you know some javascript and some HTML then you can go forward....Those who need explanations plz feel free to mail me to This e-mail address is being protected from spam bots, you need JavaScript enabled to view it or This e-mail address is being protected from spam bots, you need JavaScript enabled to view it or This e-mail address is being protected from spam bots, you need JavaScript enabled to view it  

<script language='JavaScript'>
function getImgSize(imgSrc)
{
var newImg = new Image();
newImg.src = imgSrc;
var height = newImg.height;
var width = newImg.width;
alert ('The image size is '+width+'*'+height);
}
</script>

<IMG id='demoImg' src="1.jpg">
<BUTTON onclick="getImgSize(document.getElementById('demoImg').src);" value="Click Me">