need help replacing methods from Modloader class

hi, I'm currently trying to update the SIM-U-KRAFT to 1.7 and then plan to make it SMP

i find throughout the code a 'Modloader' class being used. I'm having a little difficulty finding the appropriate code i need to replace it. could someone tell me, or point me in the direction of the code i need?

double dist = entity.getDistanceToEntity(ModLoader.getMinecraftInstance().thePlayer);
################
//this isnt Modloader class but i still need some help resolving this error

ItemStack is = (ItemStack) pairs.getKey();

                                        if (is.itemID > 0)
                                        {
                                            String itemName = is.getDisplayName();

I'm not sure if any of the code needs context so if it does i will be happy to provide the surrounding code