function isInteger(s){
	var i;
    for (i = 0; i < s.length; i++){   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }   
	// All characters are numbers.
    return true;

	}
	
	function isDouble(s){
	var i, dot, flag;
	dot = false;
	flag = true;
    for (i = 0; i < s.length; i++){   
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) {
			if (c=="."){
				if (dot)
					flag = false;
				else
					dot = true;
			}
			else	
				flag = false;
			}
    }
	return flag;
	}