window.onload = initAll;

function initAll() {

var selectmenu=document.getElementById("serviceid")
selectmenu.onchange=function(){ //run some code when "onchange" event fires
 var chosenoption=this.options[this.selectedIndex] //this refers to "selectmenu"
 if (chosenoption.value=="23"){
  window.open("http://kodakexpressau.pnimedia.com/" , "", "") //open target site (based on option's value attr) in new window
 }
}
}