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 var change=true;

function populateMark_head() {
 
	var province= document.getElementById("head_province");
	
	var selected = province.options[province.selectedIndex].value;
 
	var selectedArray = eval("headArray" + selected);
	  while (document.getElementById("head_city").options.length > 0) {
 document.getElementById("head_city").options[(document.getElementById("head_city").options.length - 1)] = null;
	  }
	for (var i=0; i < selectedArray.length; i++) {
 
  eval("document.getElementById('head_city').options[i]=" + "new Option" + selectedArray[i]);
 

	}

 document.getElementById("head_city").options[0].selected = true;
	
}

function change_city(){
if(change){
populateMark_head();
change=false;

}
}