diff --git a/src/net/mc_pandacraft/java/util/JArithmeticInterpreter.java b/src/net/mc_pandacraft/java/util/JArithmeticInterpreter.java
index add9378..bc91dc9 100644
--- a/src/net/mc_pandacraft/java/util/JArithmeticInterpreter.java
+++ b/src/net/mc_pandacraft/java/util/JArithmeticInterpreter.java
@@ -449,16 +449,19 @@ public class JArithmeticInterpreter {
 	
 	//.................................................................................... Write_Tree
 	
+	public String writeTree() {
+		StringBuffer sb = new StringBuffer();
+		writeTree(sb);
+		return sb.toString();
+	}
+	
+	
+	
+	
 	private void writeTree(StringBuffer string) {
 		boolean parenthese=false;
 	
 		switch(mOperator) {
-			case -2:
-				string.append('y');
-				break;
-			case -1:
-				string.append('x');
-				break;
 			case 0:
 				string.append(mValue);
 				break;
@@ -550,7 +553,7 @@ public class JArithmeticInterpreter {
 				string.append(')');
 				break;
 			case 9:
-				string.append("�(");
+				string.append("sqrt(");
 				fg.writeTree(string);
 				string.append(')');
 				break;
@@ -605,7 +608,7 @@ public class JArithmeticInterpreter {
 			signe=-1;
 			i++;
 		}
-		if (chaine.charAt(i)=='�') return signe*Math.PI;
+		if (chaine.charAt(i)=='�') return signe*Math.PI; // TODO changer le caractère non reconnu
 		
 		while (i<longueur && chaine.charAt(i)>47 && chaine.charAt(i)<58) {
 			temp=temp*10+(chaine.charAt(i)-48);
@@ -626,102 +629,102 @@ public class JArithmeticInterpreter {
 	//.................................................................................... FindOperator
 	
 	private static void FindOperator(VariableInt oper,VariableInt esp,StringBuffer chaine,int pos) {
-	switch(chaine.charAt(pos)) {
-	case 'a':
-		switch(chaine.charAt(pos+1)) {
-			case 'b':
-				esp.mValue=3;
-				oper.mValue=10;
-				break;
-			case 'c':
-				esp.mValue=4;
-				oper.mValue=15;
-				break;
-			case 's':
-				esp.mValue=4;
-				oper.mValue=14;
-				break;
-			case 't':
-				esp.mValue=4;
-				oper.mValue=16;
-				break;
-		}
-		break;
-	case 'c':
-		if (chaine.charAt(pos+1)=='h') {
-			esp.mValue=2;
-			oper.mValue=18;
-		}
-		else if ((chaine.charAt(pos+1)=='o') && (chaine.charAt(pos+2)=='s')) {
-			if (chaine.charAt(pos+3)=='h') {
-				esp.mValue=4;
+		switch(chaine.charAt(pos)) {
+		case 'a':
+			switch(chaine.charAt(pos+1)) {
+				case 'b':
+					esp.mValue=3;
+					oper.mValue=10;
+					break;
+				case 'c':
+					esp.mValue=4;
+					oper.mValue=15;
+					break;
+				case 's':
+					esp.mValue=4;
+					oper.mValue=14;
+					break;
+				case 't':
+					esp.mValue=4;
+					oper.mValue=16;
+					break;
+			}
+			break;
+		case 'c':
+			if (chaine.charAt(pos+1)=='h') {
+				esp.mValue=2;
 				oper.mValue=18;
 			}
-			else {
-         		esp.mValue=3;
-				oper.mValue=12;
+			else if ((chaine.charAt(pos+1)=='o') && (chaine.charAt(pos+2)=='s')) {
+				if (chaine.charAt(pos+3)=='h') {
+					esp.mValue=4;
+					oper.mValue=18;
+				}
+				else {
+	         		esp.mValue=3;
+					oper.mValue=12;
+				}
 			}
-		}
-		break;
-	case 'e':
-		if ((chaine.charAt(pos+1)=='x') && (chaine.charAt(pos+2)=='p')) {
-			esp.mValue=3;
-         	oper.mValue=6;
-		}
-		else oper.mValue=-10;
-		break;
-	case 'l':
-		if (chaine.charAt(pos+1)=='n') {
-			esp.mValue=2;
-			oper.mValue=7;
-		}
-		else if ((chaine.charAt(pos+1)=='o') && (chaine.charAt(pos+2)=='g')){
-         	esp.mValue=3;
-            oper.mValue=8;
-         }
-         else oper.mValue=-10;
-         break;
-	case 's':
-		if (chaine.charAt(pos+1)=='h') {
-			esp.mValue=2;
-			oper.mValue=17;
-		}
-		else if (chaine.charAt(pos+1)=='q') {
-			esp.mValue=4;
-			oper.mValue=9;
-		}
-		else {
-			if (chaine.charAt(pos+3)=='h') {
-				esp.mValue=4;
+			break;
+		case 'e':
+			if ((chaine.charAt(pos+1)=='x') && (chaine.charAt(pos+2)=='p')) {
+				esp.mValue=3;
+	         	oper.mValue=6;
+			}
+			else oper.mValue=-10;
+			break;
+		case 'l':
+			if (chaine.charAt(pos+1)=='n') {
+				esp.mValue=2;
+				oper.mValue=7;
+			}
+			else if ((chaine.charAt(pos+1)=='o') && (chaine.charAt(pos+2)=='g')){
+	         	esp.mValue=3;
+	            oper.mValue=8;
+	         }
+	         else oper.mValue=-10;
+	         break;
+		case 's':
+			if (chaine.charAt(pos+1)=='h') {
+				esp.mValue=2;
 				oper.mValue=17;
 			}
-			else {
-				esp.mValue=3;
-				oper.mValue=11;
-			}
-		}
-		break;
-	case 't':
-		if (chaine.charAt(pos+1)=='h') {
-			esp.mValue=2;
-			oper.mValue=19;
-		}
-		else if ((chaine.charAt(pos+1)=='a') && (chaine.charAt(pos+2)=='n')) {
-			if (chaine.charAt(pos+3)=='h') {
+			else if (chaine.charAt(pos+1)=='q') {
 				esp.mValue=4;
+				oper.mValue=9;
+			}
+			else {
+				if (chaine.charAt(pos+3)=='h') {
+					esp.mValue=4;
+					oper.mValue=17;
+				}
+				else {
+					esp.mValue=3;
+					oper.mValue=11;
+				}
+			}
+			break;
+		case 't':
+			if (chaine.charAt(pos+1)=='h') {
+				esp.mValue=2;
 				oper.mValue=19;
 			}
-			else {
-				esp.mValue=3;
-				oper.mValue=13;
+			else if ((chaine.charAt(pos+1)=='a') && (chaine.charAt(pos+2)=='n')) {
+				if (chaine.charAt(pos+3)=='h') {
+					esp.mValue=4;
+					oper.mValue=19;
+				}
+				else {
+					esp.mValue=3;
+					oper.mValue=13;
+				}
 			}
+			else oper.mValue=-10;
+			break;
+		default:
+			oper.mValue=-10;
+			break;
 		}
-		else oper.mValue=-10;
-		break;
-	default:
-		oper.mValue=-10;
-		break;
-	}
 	}
 	
 	//.................................................................................... CopyPartialString