Value: <input type='text' placeholder="Value" id="value" oninput="dosth();"> &nbsp; &nbsp; Type:
<select id="type" oninput="dosth();">
    <option>Weapon</option>
    <option>Icon</option>
    <option>Armor</option>
    <option>Hat</option>
    <option>Boots</option>
    <option>Shield</option>
</select><br>
<p id='res'>Item gfx: </p>
<script>

    function dosth(){
        type = document.getElementById("type").selectedIndex;
        res = document.getElementById("res");
        value = parseInt(document.getElementById("value").value);
        if(type==0){
            res.innerHTML = "Item gfx: " + Math.floor((value - 101) / 100 + 1);
        }
        if(type==1){
            res.innerHTML = "Item gfx: " + Math.floor((value - 101) / 2 + 1);
        }
        if(type==2){
            res.innerHTML = "Item gfx: " + Math.floor((value - 101) / 50 + 1);
        }
        if(type==3){
            res.innerHTML = "Item gfx: " + Math.floor((value - 101) / 10 + 1);
        }
        if(type==4){
            res.innerHTML = "Item gfx: " + Math.floor((value - 101) / 40 + 1);
        }
        if(type==5){
            res.innerHTML = "Item gfx: " + Math.floor((value - 101) / 50 + 1);
        }
    }
</script>