var stop_anim = false;

function replace(num){
    if(!stop_anim){
        $('#cycle_of_life > img').css('display','none');
        $('#img_' + num).css('display','block');
    }
}

function runIt(){
    setTimeout("replace(1)",500);
    setTimeout("replace(2)",1000);
    setTimeout("replace(3)",1500);
    setTimeout("replace(4)",2000);
    setTimeout("replace(5)",2500);
    setTimeout("replace('complete')",5000);
}