Please Help Me On This Script

Question

OK im working on this age of war type game if you dont now what that is its a game where you press buttons to send your troops to battle the computer ive just started but ive hit a problam this is my script for spawning the troops by presing the button ill explain the proplam i have with it under the script.
on (release) {   
if (spear>=0) {       
spear = true;
     } else {       
spear = false;   
if (spear == true) {
  this.attachMovie("spearman_mc","spearman_mc",this.getNextHighestDepth, {_x:1.1,_y:485});
_root.spearman_mc.duplicateMovieClip("spearman_mc_"+"x", x);
     setProperty("spearman_mc_"+"x", _x, 1.1);       
     setProperty("spearman_mc_"+"x", _y, 485);       
x++;       
cash-=35;   
} else {       
cash-=0;   
spearman_mc is my movieclip what gets created. spear i just put it in the code so i could use it in the if statement i might need to make it a Boolean at the start. NOW i will get to my problam when i press the button it creates the movie clip and i can keep creating them but when i get to 0 Cash (i start with 300) it still keeps creating and goes in to the minuses(-)

Answer 1

ive worked it out like i say its like a age of war type game
what should happen is tht when you click the button called spearman_btn the movie clip spearman should get attachet to a named Xaxis and a named Yaxis for example: setProperty("spearman_mc_"+"x",  _x, 95.1); and then duplicated but ive worked out now i will post another problam tonight.
this is my script now
on (release) {   
if (cash>=9) {       
this.attachMovie("spearman_mc","spearman_mc",this.getNextHighestDepth, {_x:95.1,_y:485});
_root.spearman_mc.duplicateMovieClip("man_mc_"+"x", x);
         setProperty("spearman_mc_"+"x", _x, 95.1);       
         setProperty("spearman_mc_"+"x", _y, 485);       
x++;       
cash-=10;   
} else {       
cash-=0;   
the spearman_movie clip costs 10 cash    if this dosent make sense tell me.