Loop wilt niet eindigen door onlogische reden

Hey,

er zit een fout in mijn javascript code en ik heb gewoon geen idee waarom dit gebeurd.
Deze code is zegmaar om ingevoerde gegevens te checken.
In de array "materials" zit een string met gegevens die meoten worden vergeleken met de ingevoerde gegevens van het html form.
In het gedeelte waar ik "tubemat" vergelijk met een naam in een string van de materials array gaat het fout.
Als tubemat "Steel" is dan blijft de loop oneindig doorgaan en crasht het script.
Ik zie dat Steel maar 1 keer voorkomt in het materials array.
Als ik nog 2 keer Steel zet in materials dan gaat het ineens goed.
Ik kan maar niet vinden wat de oorzaak hiervan is.

Ik hoop dat mijn code te lezen en te begrijpen is.

kan iemand mij helpen?

Highlighted Code: http://pastebin.com/HDf32bZH

[js]
function validateForm()
{
var tubemat = document.getElementById("tubemat").value;
var diameter = document.getElementById("diameter").value;
var medium = document.getElementById("medium").value;
var agressi = document.getElementById("agressi").value;
var omgeving = document.getElementById("omgeving").value;

var run = 1;
var materials = new Array();
var diameterA = new Array();
var split = new Array();
var mats = new Array();
var mats2 = new Array();
var mats3 = new Array();
var mats4 = new Array();
var mats5 = new Array();
var bar;

//Material, tubematerial, diameter, medium, agressiveness, omgeving

materials[0] = "PVDF,Plastics,4^6^8^10^12^15^16,Air^Gases^Liquid^Oil,Aggressive^Slightly aggressive^Non-aggressive,Corrosive^Non-corrosive";
materials[1] = "PA,Plastics,6^8^10^12,Air^Gases,Non-aggressive,Non-corrosive";
materials[2] = "Flip,Plastics,4^6^8^10^12,Air,Non-aggressive,Non-corrosive";
materials[3] = "Brass M,Non-ferrous metals^Plastics,2^3^4^6^8^10^12^15^18^22^28^30^35,Air^Gases^Liquid^Oil,Non-aggressive,Non-corrosive";
materials[4] = "Brass G,Non-ferrous metals^Plastics,4^6^8^10^12^15,Air^Gases^Liquid^Oil,Non-aggressive,Non-corrosive";
materials[5] = "Brass chem. nickel-plated,Non-ferrous metals^Stainless steel^Plastics,4^6^8^10^12^15^18,Air^Gases^Liquid^Oil,Slightly aggressive^Non-aggressive,Non-corrosive";
materials[6] = "Stainless Steel,Stainless steel^Plastics,2^3^4^5^6^8^10^12^15^18^22^28,Air^Gases^Liquid^Oil,Aggressive^Slightly aggressive^Non-aggressive,Corrosive^Non-corrosive";
materials[7] = "Steel,Steel^Plastics,6^8^10^12^15^18^22^28,Air^Gases^Liquid^Oil,Slightly aggressive^Non-aggressive,Non-corrosive";

//mindia-maxdia,bar^mindia-maxdia,bar^mindia- etc etc
diameterA["PVDF"] = "4-16,10^";
diameterA["PA"] = "6-12,10^";
diameterA["Flip"] = "4-12,10^";
diameterA["Brass M"] = "2-6,125^6-8,250^8-10,150^10-12,100-125^12-18,40^18-22,25^22-35,16";
diameterA["Brass G"] = "4-8,125^8-12,100^12-15,64";
diameterA["Brass chem. nickel-plated"] = "4-6,100^6-8,200^8-10,125^10-12,80^12-18,25";
diameterA["Stainless Steel"] = "2-5,250^5-8,200^8-12,160^12-18,100^18-22,64^22-28,40";
diameterA["Steel"] = "6-8,400^8-10,300^10-12,250^12-18,200^18-28,160";

if(run == 1)
{
for(var i = 0; i < materials.length; i++)
{
split = materials.split(",");
splittubemat = split[1].split("^");

if(tubemat != "Unknown")
{
for(var it = 0; it < splittubemat.length; it++)
{
if(splittubemat[it] == tubemat)
{
mats.push(materials);
}
}
}
else
{
mats.push(materials);
}
if(i == materials.length-1)
{
if(mats.length > 0)
{
//alert("materials checked "+mats.length+" materials found");

for(i = 0; i < mats.length; i++)
{
split = mats.split(",");
splitdia = split[2].split("^");

if(diameter != "Unknown")
{
for(var id = 0; id < splitdia.length; id++)
{
if(splitdia[id] == parseInt(diameter))
{
mats2.push(mats);
}
}
}
else
{
mats2.push(mats);
}
if(i == mats.length-1)
{
if(mats2.length > 0)
{
//alert("diameters checked "+mats2.length+" materials found");

for(i = 0; i < mats2.length; i++)
{
split = mats2.split(",");
splitmediums = split[3].split("^");

if(medium != "Unknown")
{
for(var im = 0; im < splitmediums.length; im++)
{
if(splitmediums[im] == medium)
{
mats3.push(mats2);
}
}
}
else
{
mats3.push(mats2);
}
if(i == mats2.length-1)
{
if(mats3.length > 0)
{
//alert("mediums checked "+mats3.length+" materials found");

for(i = 0; i < mats3.length; i++)
{
split = mats3.split(",");
splitagressi = split[4].split("^");

if(agressi != "Unknown")
{
for(var ia = 0; ia < splitagressi.length; ia++)
{
if(splitagressi[ia] == agressi)
{
mats4.push(mats3);
}
}
}
else
{
mats4.push(mats3);
}
if(i == mats3.length-1)
{
if(mats4.length > 0)
{
//alert("agressiveness checked "+mats4.length+" materials found");

for(i = 0; i < mats4.length; i++)
{
split = mats4.split(",");
splitomg = split[5].split("^");

if(omgeving != "Unknown")
{
for(io = 0; io < splitomg.length; io++)
{
if(splitomg[io] == omgeving)
{
mats5.push(mats4);
}
}
}
else
{
mats5.push(mats4);
}
if(i == mats4.length-1)
{
if(mats5.length > 0)
{
//alert("environment checked "+mats5.length+" materials found");

document.getElementById("result").innerHTML = "Material(s): ".bold();

for(i = 0; i < mats5.length; i++)
{
split = mats5.split(",");
splitdia2 = diameterA[split[0]].split("^");

if(diameter != "Unknown")
{
for(ib = 0; ib < splitdia2.length; ib++)
{
splitdia3 = splitdia2[ib].split(",");
splitdia4 = splitdia3[0].split("-");

if(parseInt(diameter) >= parseInt(splitdia4[0]) && parseInt(diameter) < parseInt(splitdia4[1]))
{
bar = splitdia3[1];
}
}
}
else
{
bar = 0;
}

document.getElementById("result").innerHTML += (split[0]+"("+bar+" bar)"+", ").bold();

if(i == mats5.length-1)
{
run = 0;
split = [];
mats = [];
mats2 = [];
mats3 = [];
mats4 = [];
mats5 = [];
}
}
}
else if(run == 1)
{
run = 0;
split = [];
mats = [];
mats2 = [];
mats3 = [];
mats4 = [];
mats5 = [];

document.getElementById("result").innerHTML = "Material(s): ".bold();

alert("Couldn`t find any materials.");
}
}
}
}
else if(run == 1)
{
run = 0;
split = [];
mats = [];
mats2 = [];
mats3 = [];
mats4 = [];
mats5 = [];

document.getElementById("result").innerHTML = "Material(s): ".bold();

alert("Couldn`t find any materials.");
}
}
}
}
else if(run == 1)
{
run = 0;
split = [];
mats = [];
mats2 = [];
mats3 = [];
mats4 = [];
mats5 = [];

document.getElementById("result").innerHTML = "Material(s): ".bold();

alert("Couldn`t find any materials.");
}
}
}
}
else if(run == 1)
{
run = 0;
split = [];
mats = [];
mats2 = [];
mats3 = [];
mats4 = [];
mats5 = [];

document.getElementById("result").innerHTML = "Material(s): ".bold();

alert("Couldn`t find any materials.");
}
}
}
}
else if(run == 1)
{
run = 0;
split = [];
mats = [];
mats2 = [];
mats3 = [];
mats4 = [];
mats5 = [];

document.getElementById("result").innerHTML = "Material(s): ".bold();

alert("Couldn`t find any materials.");
}
}
}
}
}
[/js]