function switchLetters(str,onlyLetters) {
if (onlyLetters==true) {
newstr="";
for (i=0; i<str.length; i++)
  if (str.substring(i,i+1)>="א" & str.substring(i,i+1)<="ת") newstr+=str.substring(i,i+1);
str=newstr;
}
while (str.indexOf(' ')>-1) str=str.replace(" ","");
while (str.indexOf('"')>-1) str=str.replace('"','');
while (str.indexOf("'")>-1) str=str.replace("'","");
//while (str.indexOf(',')>-1) str=str.replace(",","");
while (str.indexOf('ך')>-1) str=str.replace("ך","כ");
while (str.indexOf('ם')>-1) str=str.replace("ם","מ");
while (str.indexOf('ן')>-1) str=str.replace("ן","נ");
while (str.indexOf('ף')>-1) str=str.replace("ף","פ");
while (str.indexOf('ץ')>-1) str=str.replace("ץ","צ");
return str;
}