แสดง popup window ตรงกลาง

Javascript code

<script type="text/javascript">
function popup(url,name,windowWidth,windowHeight){    
	myleft=(screen.width)?(screen.width-windowWidth)/2:100;	
	mytop=(screen.height)?(screen.height-windowHeight)/2:100;	
	properties = "width="+windowWidth+",height="+windowHeight;
	properties +=",scrollbars=yes, top="+mytop+",left="+myleft;   
	window.open(url,name,properties);
}
</script>

HTML code

<a href="javascript:popup('http://www.google.com','',400,400)" >เปิด google.com แบบ popup </a>

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