fname_rollover = new Array(); offimg_rollover = new Array();  
onimg_rollover = new Array();

fname_rollover[1] = "menu1";
offimg_rollover[1] = "button/button_1_off.gif";
onimg_rollover[1] = "button/button_1_on.gif";
fname_rollover[2] = "menu2";
offimg_rollover[2] = "button/button_2_off.gif";
onimg_rollover[2] = "button/button_2_on.gif";
fname_rollover[3] = "menu3";
offimg_rollover[3] = "button/button_3_off.gif";
onimg_rollover[3] = "button/button_3_on.gif";
fname_rollover[4] = "menu4";
offimg_rollover[4] = "button/button_4_off.gif";
onimg_rollover[4] = "button/button_4_on.gif";
fname_rollover[5] = "menu5";
offimg_rollover[5] = "button/button_5_off.gif";
onimg_rollover[5] = "button/button_5_on.gif";
fname_rollover[6] = "menu6";
offimg_rollover[6] = "button/button_6_off.gif";
onimg_rollover[6] = "button/button_6_on.gif";
fname_rollover[7] = "menu7";
offimg_rollover[7] = "button/button_7_off.gif";
onimg_rollover[7] = "button/button_7_on.gif";
fname_rollover[8] = "menu8";
offimg_rollover[8] = "button/button_8_off.gif";
onimg_rollover[8] = "button/button_8_on.gif";

var brwsName_rollover;	// ブラウザ種類

function browserChecker_ROLLOVER()
{
  brwsName_rollover = ""; // ブラウザ名

  if ( document.all){
       brwsName_rollover = "IE";	// IE4/5/6
       return;
  }
  if (document.layers){
       brwsName_rollover = "Netscape"; // ネスケ4
       return;
  }
  if (document.getElementById){
       brwsName_rollover = "Mozilla"; // ネスケ6
       return;
  }
}

function getindex_ROLLOVER(funcname)
{
  var index = 0;	// 添え字初期値

  while(1){
	if ( index >= fname_rollover.length ){
	     index = 0;
	     break;
	}
	if ( fname_rollover[index] == funcname ){
             break;
	}
	index++;
  }
  
  return index;
}

function kickProc_ROLLOVER(funcname, mouseonoff)
{
  browserChecker_ROLLOVER();	
  if ( brwsName_rollover == "" ){
       return;	// ブラウザがネスケでもIEでもない
  }

  var index = getindex_ROLLOVER(funcname);

  chgimg_rollover = new Image();
  if ( mouseonoff == 0 ){	
       chgimg_rollover.src = offimg_rollover[index];  // MouseOff
  }else{
       chgimg_rollover.src = onimg_rollover[index];   // MouseOn
  }
  document.images[funcname].src = chgimg_rollover.src;

  return;
}