function inputAutoClear(ipt){
   if(ipt.value==ipt.defaultValue){ipt.value='';}ipt.onfocus=null;
   setTimeout(
    function(){
	  ipt.onfocus=function(){if(this.value==this.defaultValue){this.value='';}};
	  ipt.onblur=function(){if(this.value==''){this.value=this.defaultValue;}};
	  },0);
	}
// JavaScript Document
function slide(types,id,nums,class1,class2) {
 for(i=1;i<=nums;i++) {
 document.getElementById(types + i).className=class2;
 document.getElementById("_"+types+i).style.display="none";
 }
 document.getElementById(types+id).className=class1;
 document.getElementById("_"+types+id).style.display="block";
}