// Adri Meades 2005-05-03

function converthours(str) {
	var colon =":";
	if (str.indexOf(colon)>=1)
	{
	arrayOfStrings = str.split(colon);
	var num = Number(arrayOfStrings[0])*60;
	num = num + Number(arrayOfStrings[1]);
	}
	else
	{
	num = 0;
	}
	return num;
}

SortableTable.prototype.addSortType( "hhmm", converthours );