function AddStreepjes(mText) {

  //init
  var mCode = "";
  var mChar = "";
  var mChange1 = -1;
  var mChange2 = -1;
  //mText = toUpperCase(mText); 	  	
	if (mText.indexOf("-") >= 0 ){ return;}
		
  //alleen bij lengte 6
  if (mText.length == 6){
	  //elk char apart bepalen
	  for (i=0;i<6;i++){
	  	
	  	//numeriek
	  	mT = mText.substr(i, 1);
	  	if (isNaN(mT)==false){
	  		//er is een change
	      if (i > 0 && mChar == "X") { 
	        if (mChange1 == -1) {mChange1 = i;} else {mChange2 = i;}
	      }
	      mChar = "9";		
	      	      
	  	//alpha numeriek
	  	}else{
	  		//er is een change
	      if (i > 0 && mChar == "9") { 
	        if (mChange1 == -1) {mChange1 = i;} else {mChange2 = i;}
	      }
	      mChar = "X";			
	  	}  	
	  	mCode = mCode + mChar;
	  }  
	  	
	  
	  //oude combinaties
	  if (mCode.indexOf("XXXX") >= 0 || mCode.indexOf("9999") >= 0 ){
	    document.form.kenteken.value = mText.substr(0,2) + "-" + mText.substr(2,2) + "-" + mText.substr(4,2); 
	  //nieuwe combinaties 
	  }else if (mCode.indexOf("XXX") >= 0 || mCode.indexOf("999") >= 0 ){
	    if (mChange1 >= 0 && mChange2 >= 0 && mChange2 < 6){
	    	document.form.kenteken.value = mText.substr(0,mChange1) + "-" + mText.substr(mChange1, mChange2 - mChange1) + "-" + mText.substr(mChange2, (mText.length) - mChange2); 
	    //rare combinaties
	    }else{
	    	document.form.kenteken.value = mText;
	    }	  	

	  //oude combinaties 
	  }else {
	  	//alert (mText);
	    document.form.kenteken.value = mText.substr(0,2) + "-" + mText.substr(2,2) + "-" + mText.substr(4,2); 	  	
	  }
	  
	}
}