//Declaring variables, these 6 variables store the original x and y position of each draggable object
myDLoc1X=myDragged1_mc._x;
myDLoc1Y=myDragged1_mc._y;

myDLoc2X=myDragged2_mc._x;
myDLoc2Y=myDragged2_mc._y;

myDLoc3X=myDragged3_mc._x;
myDLoc3Y=myDragged3_mc._y;

//below is calling the functions of each button
myDragged1_mc.onPress=function(){ //when myDragged1_mc is “pressed” begin the following function
startDrag(this,true); // start dragging the current object ‘this’
myDrag=1; // Variable used to define which movieclip is being dragged
}//end function
myDragged1_mc.onRelease=myDragged1_mc.onReleaseOutside=function(){ //when myDragged1_mc is
//released outside of its
//original position, do the
//following functions.
stopDrag(); //stop dragging the movieclip
myHitTest(); //execute the “myHitTest” function
}//end function


myDragged2_mc.onPress=function(){
startDrag(this,true);
myDrag=2;
}
myDragged2_mc.onRelease=myDragged2_mc.onReleaseOutside=function(){
stopDrag();
myHitTest();
}


myDragged3_mc.onPress=function(){
startDrag(this,true);
myDrag=3;
}
myDragged3_mc.onRelease=myDragged3_mc.onReleaseOutside=function(){
stopDrag();
myHitTest();
}
//stop defining button functions



//now we define the functions that are called from the button

function myHitTest(){ //the function name
myFocus=_root["myDragged"+myDrag+"_mc"];

/*the previous line of code is setting variable “myFocus” (‘_root’ means the very bottom of the flash movie) to “myDragged” followed by variable (defined by buttons earlier) ‘myDrag’ and then “_mc”, e.g. “myDragged2_mc”*/

if (myFocus.hitTest(myTarget_mc) == true){ // a hitTest can be used to check if the mouse is inside
// of the movieclip in brackets, in this case
// “myTarget_mc”

trace("hit"); //this will launch an output window that should say “hit” to check if the hit
// test was successful

myDestinationX=myTarget_mc._x; //defining local variable “myDestinationX” as the X
//position of the target movieclip

myDestinationY=myTarget_mc._y; //same as above but defining the Y position

myMovements(); //Calling the myMovements Function (defined later) this is how the
//dragged MC shall move to the target MC or back to its original position

}else{ //if the hitTest does not equal false

trace("nohit"); //trace noHit to show the MC has not hit the target_MC

myDestinationX=_root["myDLoc"+myDrag+"X"]; //the myDestinationX local variable
//is now set to the movieclip’s original
//position so that it can move back to it’s
//starting place

myDestinationY=_root["myDLoc"+myDrag+"Y"]; //same as above but defining ‘Y’

myMovements(); //again this calls the myMovements Function
}//end else
}//end function


function myMovements(){ //defining the myMovements Function

myFocus.onEnterFrame=function(){ //every frame, carry out the following function,

if(myFocus._xmyFocus._x+=10; //myFocus’s x position will increase by 10 pixels

if(myFocus._x>=myDestinationX){ // if myFocus x position is the same or more than
// myDestinationX’s X position
myFocus._x=myDestinationX; // set myFocus’s X position to the same as
//myDestinationX’s
} // end 2nd if
} end 1st if
if(myFocus._x>myDestinationX){ //basically the same as above but if myFocus’s X pos.
//is more than DestinationX’s then decrease myFocus’s //x position
myFocus._x-=10;
if(myFocus._x<=myDestinationX){
myFocus._x=myDestinationX;

}end 2nd if

} //end 1st if

if(myFocus._y//for the MC’s Y position
myFocus._y+=10;
if(myFocus._y>=myDestinationY){
myFocus._y=myDestinationY;
}
}

if(myFocus._y>myDestinationY){
myFocus._y-=10;
if(myFocus._y<=myDestinationY){
myFocus._y=myDestinationY;
}
}

if(myFocus._y==myDestinationY && myFocus._x==myDestinationX){
//use double equal signs for ‘is equal to’ this is saying if myfocus’s x and y positions are equal to that of ‘myDestination’s’
delete myFocus.onEnterFrame; //delete the onEnterFrame Function
trace("deleted"); //and trace that the enter frame has been deleted
}//end last if statement
}//end the enterFrame function
}//end Function

That should work fine, let me know you need any help

Source1 - 7507draganddrop.swf (right-click > "save target as" to download)

Source2 - 7507draganddrop.fla (right-click > "save target as" to download)

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