ВНИМАНИЕ!!!!

<script language="JavaScript">   
<!--   
function myFunction1(){   
if (date<=myDate) month1=12-(month-myMonth);   
else month1=11-(month-myMonth);   
}   
function myFunction2(){   
if (date>myDate) month1=(myMonth-month-1);   
else month1=(myMonth-month);   
}   
function myFunction3(){   
if (date<=myDate) month1=0;   
else month1=11;   
}   
function myFunction4(){   
if (month==2) date1=(28-date+myDate);   
if (month==4) date1=(30-date+myDate);   
if (month==6) date1=(30-date+myDate);   
if (month==9) date1=(30-date+myDate);   
if (month==11) date1=(30-date+myDate);   
if (month==1) date1=(31-date+myDate);   
if (month==3) date1=(31-date+myDate);   
if (month==5) date1=(31-date+myDate);   
if (month==7) date1=(31-date+myDate);   
if (month==8) date1=(31-date+myDate);   
if (month==10) date1=(31-date+myDate);   
if (month==12) date1=(31-date+myDate);   
}   
var date=(new Date()).getDate();   
var month=(new Date()).getMonth()+1;   

<?if(substr($USER_BIRTHDAY$,8,2)='01')?>var myDate=1<?endif?>   
<?if(substr($USER_BIRTHDAY$,8,2)='02')?>var myDate=2<?endif?>   
<?if(substr($USER_BIRTHDAY$,8,2)='03')?>var myDate=3<?endif?>   
<?if(substr($USER_BIRTHDAY$,8,2)='04')?>var myDate=4<?endif?>   
<?if(substr($USER_BIRTHDAY$,8,2)='05')?>var myDate=5<?endif?>   
<?if(substr($USER_BIRTHDAY$,8,2)='06')?>var myDate=6<?endif?>   
<?if(substr($USER_BIRTHDAY$,8,2)='07')?>var myDate=7<?endif?>   
<?if(substr($USER_BIRTHDAY$,8,2)='08')?>var myDate=8<?endif?>   
<?if(substr($USER_BIRTHDAY$,8,2)='09')?>var myDate=9<?endif?>   
<?if(substr($USER_BIRTHDAY$,8,2)='10')?>var myDate=10<?endif?>   
<?if(substr($USER_BIRTHDAY$,8,2)='11')?>var myDate=11<?endif?>   
<?if(substr($USER_BIRTHDAY$,8,2)='12')?>var myDate=12<?endif?>   
<?if(substr($USER_BIRTHDAY$,8,2)='13')?>var myDate=13<?endif?>   
<?if(substr($USER_BIRTHDAY$,8,2)='14')?>var myDate=14<?endif?>   
<?if(substr($USER_BIRTHDAY$,8,2)='15')?>var myDate=15<?endif?>   
<?if(substr($USER_BIRTHDAY$,8,2)='16')?>var myDate=16<?endif?>   
<?if(substr($USER_BIRTHDAY$,8,2)='17')?>var myDate=17<?endif?>   
<?if(substr($USER_BIRTHDAY$,8,2)='18')?>var myDate=18<?endif?>   
<?if(substr($USER_BIRTHDAY$,8,2)='19')?>var myDate=19<?endif?>   
<?if(substr($USER_BIRTHDAY$,8,2)='20')?>var myDate=20<?endif?>   
<?if(substr($USER_BIRTHDAY$,8,2)='21')?>var myDate=21<?endif?>   
<?if(substr($USER_BIRTHDAY$,8,2)='22')?>var myDate=22<?endif?>   
<?if(substr($USER_BIRTHDAY$,8,2)='23')?>var myDate=23<?endif?>   
<?if(substr($USER_BIRTHDAY$,8,2)='24')?>var myDate=24<?endif?>   
<?if(substr($USER_BIRTHDAY$,8,2)='25')?>var myDate=25<?endif?>   
<?if(substr($USER_BIRTHDAY$,8,2)='26')?>var myDate=26<?endif?>   
<?if(substr($USER_BIRTHDAY$,8,2)='27')?>var myDate=27<?endif?>   
<?if(substr($USER_BIRTHDAY$,8,2)='28')?>var myDate=28<?endif?>   
<?if(substr($USER_BIRTHDAY$,8,2)='29')?>var myDate=29<?endif?>   
<?if(substr($USER_BIRTHDAY$,8,2)='30')?>var myDate=30<?endif?>   
<?if(substr($USER_BIRTHDAY$,8,2)='31')?>var myDate=31<?endif?>   

<?if(substr($USER_BIRTHDAY$,5,2)='01')?>var myMonth=1<?endif?>   
<?if(substr($USER_BIRTHDAY$,5,2)='02')?>var myMonth=2<?endif?>   
<?if(substr($USER_BIRTHDAY$,5,2)='03')?>var myMonth=3<?endif?>   
<?if(substr($USER_BIRTHDAY$,5,2)='04')?>var myMonth=4<?endif?>   
<?if(substr($USER_BIRTHDAY$,5,2)='05')?>var myMonth=5<?endif?>   
<?if(substr($USER_BIRTHDAY$,5,2)='06')?>var myMonth=6<?endif?>   
<?if(substr($USER_BIRTHDAY$,5,2)='07')?>var myMonth=7<?endif?>   
<?if(substr($USER_BIRTHDAY$,5,2)='08')?>var myMonth=8<?endif?>   
<?if(substr($USER_BIRTHDAY$,5,2)='09')?>var myMonth=9<?endif?>   
<?if(substr($USER_BIRTHDAY$,5,2)='10')?>var myMonth=10<?endif?>   
<?if(substr($USER_BIRTHDAY$,5,2)='11')?>var myMonth=11<?endif?>   
<?if(substr($USER_BIRTHDAY$,5,2)='12')?>var myMonth=12<?endif?>   

if (month>myMonth) myFunction1();   
if (month<myMonth) myFunction2();   
if (month==myMonth) myFunction3();   
if (date<=myDate) date1=(myDate-date);   
if (date>myDate) myFunction4();   
if (month1==1) monthtxt=("месяц");   
if (month1>1 && month1<5) monthtxt=("месяцa");   
if (month1>4) monthtxt=("месяцев");   
if (date1==1, 21) datetxt=("день");   
if (date1>1 && date1<5) datetxt=("дня");   
if (date1>21 && date1<25) datetxt=("дня");   
if (date1>4 && date1<21) datetxt=("дней");   
if (date1>24 && date1<31) datetxt=("дней");   
var txt=("До дня рождения:");   
if (month1==0 && date1==0) txt=("Сегодня мой день рождения! :)))");   
document.write('<font color="#000000">'+txt+'</font>');   
if (month1>0) document.write('<font color="#000000">'+month1+" "+monthtxt+'</font>');   
else document.write("");   
if (date1>0) document.write('<font color="#000000"> '+date1+" "+datetxt+'</font>');   
else document.write("");   
// -->   
</script>