window.open -method and php

I'm trying to create a button which would open another page in a new browser window, but I am having hard time with the javascript window.open -method.
What is the correct syntax?
Is it a problem with quotation marks?

This is the script which just doesn't work:

echo "<form>";
echo "<input type='button' value='open new window' onClick='newWin=window.open('anotherPage.php','newWin','width=200 height=100');'>";
echo "</form>";

 

echo '<input type="button" value="open new window" onClick="newWin=window.open(\'anotherPage.php\',\'newWin\',\'width=200 height=100\');">';

PHP:

Have a look at this page:
http://www.php.net/manual/en/language.types.string.php