// Function to find the index in an array of the first entry 
// with a specific value.
// It is used to get the index of a column in the column list.
Array.prototype.findIdx = function(value){
    for (var i=0; i < this.length; i++) {
        if (this[i] == value) {
            return i;
        }
    }
}
	// Error handler for the asynchronous functions.
var handleError = function(statusCode, statusMsg)
{
    alert('An Error Occurred. \nStatus: ' + statusCode + '\n' + statusMsg);
}