var a=window.location.href;
var str="";
if (a)
   { 
     var temp_array=str.split("?");
    
      if (temp_array.length>1)
           {  str=temp_array[0]+"?presentationtemplate=page_print";  }
       else
          {   str=a.substring(0,a.length)+"?presentationtemplate=page_print";
          }   
 var el=document.getElementById("print_button");
 el.href=str;
  }
//-----------------------------------------------------------------------------------------------------------