function changeImage(){ 
today = new Date();

if(today.getMonth() == 0) 
{ 
document.write("<img src='css/img/cale_01.gif' alt='1月' height='54' width='145'>");
}
if(today.getMonth() == 1) 
{ 
document.write("<img src='css/img/cale_02.gif' alt='2月' height='54' width='145'>");
}
if(today.getMonth() == 2) 
{ 
document.write("<img src='css/img/cale_03.gif' alt='3月' height='54' width='145'>");
}
if(today.getMonth() == 3) 
{ 
document.write("<img src='css/img/cale_04.gif' alt='4月' height='54' width='145'>");
}
if(today.getMonth() == 4) 
{ 
document.write("<img src='css/img/cale_05.gif' alt='5月' height='54' width='145'>");
}
if(today.getMonth() == 5) 
{ 
document.write("<img src='css/img/cale_06.gif' alt='6月' height='54' width='145'>");
}
if(today.getMonth() == 6) 
{ 
document.write("<img src='css/img/cale_07.gif' alt='7月' height='54' width='145'>");
}
if(today.getMonth() == 7) 
{ 
document.write("<img src='css/img/cale_08.gif' alt='8月' height='54' width='145'>");
}
if(today.getMonth() == 8) 
{ 
document.write("<img src='css/img/cale_09.gif' alt='9月' height='54' width='145'>");
}
if(today.getMonth() == 9) 
{ 
document.write("<img src='css/img/cale_10.gif' alt='10月' height='54' width='145'>");
}
if(today.getMonth() == 10) 
{ 
document.write("<img src='css/img/cale_11.gif' alt='11月' height='54' width='145'>");
}
if(today.getMonth() == 11) 
{ 
document.write("<img src='css/img/cale_12.gif' alt='12月' height='54' width='145'>");
}
}