JavaScript add area Preview and Print button

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<script language= "JavaScript" > Function Preview () { bdhtml=window.document.body.innerhtml; Sprnstr= "<!--startprint-->"; Eprnstr= "<!--endprint-->"; Prnhtml=bdhtml.substr (Bdhtml.indexof (SPRNSTR) +17); Prnhtml=prnhtml.substring (0,prnhtml.indexof (EPRNSTR)); window.document.body.innerhtml=prnhtml; Window.print (); } </script> <div> file head, not print out the content ... </div> <div> file head, not print out the content ... </div> <div> file head, not print out the content ... </div> <!--startprint--> <div> This is the content that is printed </div> <div> This is the content that is printed </div> <div> This is the content that is printed </div> <div> This is the content that is printed </div> <!--endprint--> <div> the tail of the file, do not print out the content ... </div> <div> the tail of the file, do not print out the content ... </div> <div> the tail of the file, do not print out the content ... </div> <input type= "button" name= "print" value= "Preview and print" onclick= "Preview ()" >