if (k == 0 || k == 1) { //if left or right click
    				
    		int stackSize = 64;
    		if (k == 1) { //if right click
    			stackSize = 1;
    		}
    		
    		Slot cslot = super.getSlotAtCoords(i, j);
    		if (cslot!=null) { //if they actually clicked a slot
    			
	    		ItemStack slotstack = cslot.getStack();
	    		ItemStack pstack = mc.thePlayer.inventory.getItemStack();
	    		
	    		if (slotstack!=null) { //if there is an item in that slot
		  				
	    			if(pstack==null) { //if the player is not holding an item with the cursor
		  					
	    				if (cslot.slotNumber>=72&&cslot.slotNumber<=80) { //hotbar slots
	    					stackSize = slotstack.stackSize;
	    				}
	    				ItemStack newstack = new ItemStack(slotstack.itemID, stackSize, slotstack.getItemDamage());
		  			mc.thePlayer.inventory.setItemStack(newstack);
		   		
					if (cslot.slotNumber>=72&&cslot.slotNumber<=80) { //hotbar slots
			    			cslot.putStack(null);
			    		}
			    		
		    		} else { //if the player is holding an item with the cursor
		    			
		    			if (cslot.slotNumber>=72&&cslot.slotNumber<=80) { //hotbar slots
		    				
		    				mc.thePlayer.inventory.setItemStack(slotstack); //switch the held item with the slot item
		    				cslot.putStack(pstack);
		    				
		    				//if they're the same item type and they're stackable and the slot stack isn't already full 
		    				if (pstack.isItemEqual(cslot.getStack())&&pstack.isStackable()&&cslot.getStack().stackSize<64) { 
		    					ItemStack cstack = cslot.getStack();
		    					
		    					if (k == 0) { //if left click
		    						while (cslot.getStack().stackSize<64&&pstack.stackSize>=1) {
		    							pstack.stackSize-=1;
		    							cslot.putStack(new ItemStack(cstack.itemID, cstack.stackSize+1, cstack.getItemDamage()));
		    						}
		    					} else { //if right click
		    						pstack.stackSize-=1;
		    						cslot.putStack(new ItemStack(cstack.itemID, cstack.stackSize+1, cstack.getItemDamage()));
		    					}
		    					if (pstack.stackSize==0) {
		    						mc.thePlayer.inventory.setItemStack(null);
		    					}
		    				}
		    				
			    		} else {
			    			mc.thePlayer.inventory.setItemStack(null);
			    		}
		    		}
	    			
	    		} else { //if there is not an item in that slot
	    			
	    			if (pstack!=null) { //if the player is holding an item with the cursor
	    				
	    				if (cslot.slotNumber>=72&&cslot.slotNumber<=80) { //if clicked in hotbar slots
	    					
	    					if (k == 0) { //if left click
	    						cslot.putStack(pstack);
	    						mc.thePlayer.inventory.setItemStack(null);
	    						
	    					} else { //if right click
	    						cslot.putStack(new ItemStack(pstack.itemID, 1, pstack.getItemDamage()));
	    						mc.thePlayer.inventory.setItemStack(new ItemStack(pstack.itemID, pstack.stackSize-1, pstack.getItemDamage()));
	    					}
		    				
	    				} else { //if clicked in item selection area
	    					mc.thePlayer.inventory.setItemStack(null);
	    					
	    				}
		    				
	    			}
	    		}
    		}
    	}