取年份，并且年份下拉框上下浮动5年！！

		   var sel=document.getElementById("YEAR_FLAG");
		   sel.innerHTML='';
		   var cyear;
		   if(value==null){
		      var now=new Date();
		      cyear=now.getYear();
		      value=cyear;
		   }else{
		      cyear=value;
		   }
		   for(var i=0;i<=10;i++){
		      var op=new Option();
		      op.value=parseInt(cyear)-(5-i);
		      op.text=parseInt(cyear)-(5-i);
		      sel.options.add(op);  
		   }
		   	sel.selectedIndex=5;