r,0);if(symbol==null)
  mask="l";else{str=AMremoveCharsAndBlanks(str,symbol.input.length);if(symbol.input!="{")
  mask="l";else do{symbol=AMgetSymbol(str);if(symbol!=null){str=AMremoveCharsAndBlanks(str,symbol.input.length);if(symbol.input!="}")
  mask=mask+symbol.input;}}while(symbol!=null&&symbol.input!=""&&symbol.input!="}");}
  result=AMparseExpr("{"+str,true,true);node=AMcreateMmlNode("mtable",result[0]);mask=mask.replace(/l/g,"left ");mask=mask.replace(/r/g,"right ");mask=mask.replace(/c/g,"center ");