Get values from input range

Hi,

This is my first post as I’m currently working on a configurator for architecture.
I want to allow the user to set the floor plan dimensions with a slider system.
I have grabbed this snippet to make this slider that actually works while being very simple.

<Script language=’javascript’>
function updateTextInput(val) {
document.getElementById(‘textInput’).value=val;
}
</script>

<input type=”range” name=”rangeInput” min=”0″ max=”100″ onchange=”updateTextInput(this.value);”>
<input type=”text” id=”textInput” value=””>

But I can’t get values from this input back in my puzzle module. I’ve tried several possibilities with no success.
Could you tell how I can proceed, or maybe it’s impossible ?

Thanks a lot