How can I create a macro that edits the PDF Export Stylesheet header and footers?

[RAMARAO G]

@page  
{  
    @top-left  
    {  
        content: "Left Part of Header";  
        font-family: ConfluenceInstalledFont, Helvetica, Arial, sans-serif;  
        font-size: 8pt;  
    }  
    @top-right  
    {  
        content: "Right Part of Header";  
        font-family: ConfluenceInstalledFont, Helvetica, Arial, sans-serif;  
        font-size: 8pt;  
    }  
    @bottom-left
    {  
        content: "Left Part of Footer";  
        font-family: ConfluenceInstalledFont, Helvetica, Arial, sans-serif;  
        font-size: 8pt;  
    }  
    @bottom-center 
    {  
        content: "Center Part of Footer";
        white-space: pre;
        font-family: ConfluenceInstalledFont, Helvetica, Arial, sans-serif;  
        font-size: 8pt;  
    }  
    @bottom-right  
    {  
        content: "Page " counter(page) " of " counter(pages);  
        font-family: ConfluenceInstalledFont, Helvetica, Arial, sans-serif;  
        font-size: 8pt;  
    }  
}