UnescapeUTF8=function(str){
return str.replace(/%(E(0%[AB]|[1-CEF]%[89AB]|D%[89])[0-9A-F]|C[2-9A-F]|D[0-9A-F])%[89AB][0-9A-F]|%[0-7][0-9A-F]/ig,function(s){
var c=parseInt(s.substring(1),16);
return String.fromCharCode(c<128?c:c<224?(c&31)<<6|parseInt(s.substring(4),16)&63:((c&15)<<6|parseInt(s.substring(4),16)&63)<<6|parseInt(s.substring(7),16)&63)
	})
};
var error = "%E5%85%A5%E5%8A%9B%E6%AC%84%E3%81%AB%E7%A9%BA%E7%99%BD%E3%81%8C%E3%81%82%E3%82%8A%E3%81%BE%E3%81%99";

var colorful = new ColorfulInput;
colorful.skip = ['submit'];
colorful.color['focus'] = '#F6F6CC';

window.onload = function() {
   colorful.set();
}

function ColorfulInput() {
   this.skip  = [];
   this.color = { 'blur': '', 'focus': '#EEEEEE' };

   this.set = function() {
      for (var i = 0; i < document.forms.length; i++) {
         for (var f = 0; f < document.forms[i].length; f++) {
            var elm = document.forms[i][f];
            if(!this._checkSkip(elm)) continue;

            this._setColor(elm, 'focus');
            this._setColor(elm, 'blur');
         }
      }
   }

   this._checkSkip = function(elm) {
      for(var i in this.skip) {
         if(elm.type == this.skip[i]) return false;
      }
      return true;
   }

   this._setColor = function(elm, type) { 
      var color = this.color[type];
      var event = function() { elm.style.backgroundColor = color; };

      if(elm.addEventListener) {
         elm.addEventListener(type, event, false);
      } else if(elm.attachEvent) {
         elm.attachEvent('on'+type, event);
      } else {
         elm['on'+type] = event;
      }
   }
}

function check(){
var er = 0;
	if(document.getElementById("chk1").value == ""){
		er = 1;
	}else if(document.getElementById("chk2").value == ""){
		er = 1;
	}else if(document.getElementById("chk3").value == ""){		
		er = 1;
	}else if(document.getElementById("chk4").value == ""){
		er = 1;		
	}

	if(er == 1){
		alert(UnescapeUTF8(error));
		return false;
	}else{
		return true;
	}
}