How to do script for print page?

[toplisek]

I do not know how to do that it will open dialog box for printing particular window when user clicks on link PRINT

[Twey]

<a href="javascript:void(0);" onclick="if(window.print) window.print();return false;">Print</a>

[toplisek]

I have code to open new window

     <a href="myfile.pdf" onclick="NewWindow(this.href,'Port','600','420','yes');return false;"> 

Is possible to add into this code also code which will open automatic print dialog box? I have code to print when user clicks on link Print:

 <a href="javascript:void(0);" onclick="if(window.print) window.print();return false;">Print</a> 

I can not put into href="" because there is already href="myfile.pdf"

Is this possible?