Swim hover destination - work in progress

//THIS SCRIPT DOESN'T WORK. TROUBLESHOOTING

$${
//Credit to Sanwi for creating the swim hover script: http://pastebin.com/aiuESR4H

if(!swimhover);
    set(swimhover);
    #y_anchor = %YPOS%;
    do;
        if(KEY_SPACE);
            keydown(jump);
            #y_anchor = %YPOS%;
        elseif(KEY_LSHIFT);
            keyup(jump);
            #y_anchor = %YPOS%;
        elseif(#y_anchor > %YPOS%);
            keydown(jump);
        else;
            keyup(jump);
        endif;
    loop;

    PROMPT(&inputcoords,"$$?","Enter target destination coordinates: x and z",true,"%&inputcoords%");
    replace(&inputcoords,"\"","");
    #endcoords[] = split(" ","%&inputcoords%");

    do
        CALCYAWTO(%#endcoords[0]%,%#endcoords[1]%,#yaw);
        inc(#yaw,180);
        looks(%#yaw%,+0,.1);

        keydown(forward);

        if( #distance != #olddistance);
            #olddistance = #distance;
            log("%XPOS%, %ZPOS% (%YPOS%)  D: %#distance%");
        endif;

    while( (XPOS != %#endcoords[0]%) || ((ZPOS != %#endcoords[1]%) );

    keyup(forward);


else;
        unset(swimhover);
        if(!KEY_SPACE);
                keyup(jump);
        endif;
        stop();
endif;

stop();

}$$