function instr(str, arry, n, m){
var x = '', j=0;
str = str.split('');
for(var i=n; i < str.length -1; i+=m){
if(j < array.length){
str[i] += array[i];
j++;
}
}
x = str.join('');
return x;
}
function instr(str, arry, n, m){
var x = '', j=0;
str = str.split('');
for(var i=n; i < str.length -1; i+=m){
if(j < array.length){
str[i] += array[i];
j++;
}
}
x = str.join('');
return x;
}