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var latin=("q-w-e-r-t-y-u-i-o-p-]-a-s-d-f-g-h-j-k-l-;-'-z-x-c-v-b-n-m-,-Q-W-E-R-T-Y-U-I-O-P-]-A-S-D-F-G-H-J-K-L-;-'-Z-X-C-V-B-N-M-,").split("-")
var ciril=("й-ц-у-к-е-н-г-ш-щ-з-ъ-ф-ы-в-а-п-р-о-л-д-ж-э-я-ч-с-м-и-т-ь-б-Й-Ц-У-К-Е-Н-Г-Ш-Щ-З-Ъ-Ф-Ы-В-А-П-Р-О-Л-Д-Ж-Э-Я-Ч-С-М-И-Т-Ь-Б").split("-")
function advert()
{
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for(qw=0; qw<=(latin.length-1); qw++)
{var latin1="/"+latin[qw]+"/g"
val1=val1.replace(eval(latin1), ciril[qw])}
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function advert1()
{
var val=document.selection.createRange()
var val1=val.text
var qw=0
for(qw=0; qw<=(latin.length-1); qw++)
{var ciril1="/"+ciril[qw]+"/g"
val1=val1.replace(eval(ciril1), latin[qw])}
val.text=val1}
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<input type="button" value="EN->RU" onclick="advert()" />
<input type="button" value="RU->EN" onclick="advert1()" />

<script type="text/javascript">
var latin=("a-b-v-g-d-e-yo-zh-z-i-k-l-m-n-o-p-r-s-t-u-f-h-c-ch-sh-sch-''-y-'-e-yu-ya-i-A-B-V-G-D-E-YO-ZH-Z-I-I-K-L-M-N-O-P-R-S-T-U-F-H-C-CH-SH-SCH-''-Y-'-E-YU-YA").split("-")
var ciril=("а-б-в-г-д-е-ё-ж-з-и-к-л-м-н-о-п-р-с-т-у-ф-х-ц-ч-ш-щ-ъ-ы-ь-э-ю-я-й-А-Б-В-Г-Д-Е-Ё-Ж-З-И-Й-К-Л-М-Н-О-П-Р-С-Т-У-Ф-Х-Ц-Ч-Ш-Щ-Ъ-Ы-Ь-Э-Ю-Я").split("-")
function advert()
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var val1=val.text
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for(qw=0; qw<=(latin.length-1); qw++)
{var latin1="/"+latin[qw]+"/g"
val1=val1.replace(eval(latin1), ciril[qw])}
val.text=val1}
function advert1()
{
var val=document.selection.createRange()
var val1=val.text
var qw=0
for(qw=0; qw<=(latin.length-1); qw++)
{var ciril1="/"+ciril[qw]+"/g"
val1=val1.replace(eval(ciril1), latin[qw])}
val.text=val1}
</script>
<input type="button" value="Translit->Рус." onclick="advert()" />
<input type="button" value="Рус.->Translit" onclick="advert1()" />