//文字定義
half = "0123456789";
half += "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
half += "abcdefghijklmnopqrstuvwxyz";
half += "-+_@., ";
half += "アイウエオカキクケコサシスセソタチツテトナニヌネノハヒフヘホマミムメモヤユヨラリルレロワヲンァィゥェォッャュョー";
halfArr = new Array("ヴ","ガ","ギ","グ","ゲ","ゴ","ザ","ジ","ズ","ゼ","ゾ","ダ","ヂ","ヅ","デ","ド","バ","ビ","ブ","ベ","ボ","パ","ピ","プ","ペ","ポ");

full = "０１２３４５６７８９";
full += "ＡＢＣＤＥＦＧＨＩＪＫＬＭＮＯＰＱＲＳＴＵＶＷＸＹＺ";
full += "ａｂｃｄｅｆｇｈｉｊｋｌｍｎｏｐｑｒｓｔｕｖｗｘｙｚ";
full += "－＋＿＠．，　";
full += "ｱｲｳｴｵｶｷｸｹｺｻｼｽｾｿﾀﾁﾂﾃﾄﾅﾆﾇﾈﾉﾊﾋﾌﾍﾎﾏﾐﾑﾒﾓﾔﾕﾖﾗﾘﾙﾚﾛﾜｦﾝｧｨｩｪｫｯｬｭｮｰ";
fullArr = new Array("ｳﾞ","ｶﾞ","ｷﾞ","ｸﾞ","ｹﾞ","ｺﾞ","ｻﾞ","ｼﾞ","ｽﾞ","ｾﾞ","ｿﾞ","ﾀﾞ","ﾁﾞ","ﾂﾞ","ﾃﾞ","ﾄﾞ","ﾊﾞ","ﾋﾞ","ﾌﾞ","ﾍﾞ","ﾎﾞ","ﾊﾟ","ﾋﾟ","ﾌﾟ","ﾍﾟ","ﾎﾟ");



function chgMessHalf(item , formId){
  
  var fm = document.getElementById(formId);

  messIn = fm.elements[item].value;
  messOut = "";

  //半角カナ用
  for(i=0; i<halfArr.length; i++){
    reg = new RegExp(fullArr[i],"g"); 
    messIn = messIn.replace(reg, halfArr[i]);
  }

  for(i=0; i<messIn.length; i++){
    oneStr = messIn.charAt(i);
    num = full.indexOf(oneStr,0);
    oneStr = num >= 0 ? half.charAt(num) : oneStr;
    messOut += oneStr;
  }

  fm.elements[item].value = messOut;
}//end chgMessHalf