How to center pop up window

[sher_amf]

I have this widget in my blog, how do I center the pop up window?

<form style="border:1px solid #ccc;padding:3px;text-align:left; background: url(http://i50.tinypic.com/5vc86x.png);" action="http://feedburner.google.com/fb/a/mailverify" method="post" target="popupwindow" onsubmit="window.open('http://feedburner.google.com/fb/a/mailverify?uri=techglimpse', 'popupwindow', 'scrollbars=yes,width=560,height=525');return true"><p><input type="text" style="width:180px" name="email" onblur="if (this.value == '') {this.value = 'enter your email address';}" onfocus="if (this.value == 'enter your email address') {this.value = '';}" value="Enter your email address"/></p><input type="hidden" value="Techglimpse" name="uri"/><input type="hidden" name="loc" value="en_US"/><input type="submit" value="Subscribe" /></form>

[websitedesign14]

Try to use this:

unction popitup(url,newH,newW)
{ var left = (screen.width-newW)/2;
var top = (screen.height-newH)/2;
var newW = w + 100;
var newH = h + 100;
myWindow = window.open(url, 'name', 'width='+newW+',height='+newH+',left='+left+',top='+top);
myWindow.resizeTo(newW, newH);
myWindow.moveTo(left, top);
myWindow.focus();
}

hope this works...

[sher_amf]

but how do I use the function in my code? where do i insert?

[codefish]

I made a small modification of sher_amf's code

function popitup(url,name,newH,newW)
{ var left = (screen.width-newW)/2;
var top = (screen.height-newH)/2;
var newW = w + 100;
var newH = h + 100;
myWindow = window.open(url, name, 'width='+newW+',height='+newH+',left='+left+',top='+top);
myWindow.resizeTo(newW, newH);
myWindow.moveTo(left, top);
myWindow.focus();
}


In the code replace the onsubmit property of the form with this one:

onsubmit="popitup('http://feedburner.google.com/fb/a/mailverify?uri=techglimpse', 'popupwindow', 525, 560)"

[sher_amf]

This is what I did

function popitup(url,name,newH,newW)
{	var left = (screen.width-newW)/2;
var top = (screen.height-newH)/2;
var newW = w + 100;
var newH = h + 100;
myWindow = window.open(url, name, 'width='+newW+',height='+newH+',left='+left+',top='+top);
myWindow.resizeTo(newW, newH);
myWindow.moveTo(left, top);
myWindow.focus();
}

<form style="border:0px solid #ccc;padding:3px;text-align:left; background: url(http://i50.tinypic.com/5vc86x.png);" action="http://feedburner.google.com/fb/a/mailverify" method="post" target="popupwindow" onsubmit="popitup('http://feedburner.google.com/fb/a/mailverify?uri=techglimpse', 'popupwindow', 525, 560)"><p><input type="text" style="width:180px" name="email" onblur="if (this.value == '') {this.value = 'enter your email address';}" onfocus="if (this.value == 'enter your email address') {this.value = '';}" value="Enter your email address"/></p><input type="hidden" value="Techglimpse" name="uri"/><input type="hidden" name="loc" value="en_US"/><input type="submit" value="Subscribe" /></form>

This is what happened
http://i49.tinypic.com/11kf9f4.jpg

[GettingSmart]

The code u pasted, is that the actual code?
You didn't put the function between javascript tags

try:

<script type="text/javascript">
function popitup(url,name,newH,newW)
{	var left = (screen.width-newW)/2;
var top = (screen.height-newH)/2;
var newW = w + 100;
var newH = h + 100;
myWindow = window.open(url, name, 'width='+newW+',height='+newH+',left='+left+',top='+top);
myWindow.resizeTo(newW, newH);
myWindow.moveTo(left, top);
myWindow.focus();
}
</script>
<form style="border:0px solid #ccc;padding:3px;text-align:left; background: url(http://i50.tinypic.com/5vc86x.png);" action="http://feedburner.google.com/fb/a/mailverify" method="post" target="popupwindow" onsubmit="popitup('http://feedburner.google.com/fb/a/mailverify?uri=techglimpse', 'popupwindow', 525, 560)"><p><input type="text" style="width:180px" name="email" onblur="if (this.value == '') {this.value = 'enter your email address';}" onfocus="if (this.value == 'enter your email address') {this.value = '';}" value="Enter your email address"/></p><input type="hidden" value="Techglimpse" name="uri"/><input type="hidden" name="loc" value="en_US"/><input type="submit" value="Subscribe" /></form>

[sher_amf]

It didn't worked, what it did is open to a new window...