passing string to javascript function from asp

Hi,
i tried the following to use a string from asp code in javascript but it didnt work....please tell me how to pass a string to a javascript

 <script language="JavaScript">
function ChangeAll(f)
{
	
	alert(f);
}

</script>

<%



r="here"
response.write("<form method='post'>")
response.write("<input type='button' value='Submit' onClick='ChangeAll(''"&r&"'')'    ")
response.write("</form>")

%>

Code (markup):

 

Escape quotes

response.write("<input type='button' value='Submit' onClick='ChangeAll("""&r&"""')'>")

Code (markup):

this code should produce this:

<input type='button' value='Submit' onClick='ChangeAll("value of r")'>

Code (markup):