function fillCategory(){ 
 // this function is used to fill the category list on load
 addOption(document.drop_list.soort, " ", " ", "");
addOption(document.drop_list.soort, "MFP", "MFP", "");
addOption(document.drop_list.soort, "PRINTER", "PRINTER", "");
addOption(document.drop_list.soort, "FAX", "FAX", "");
addOption(document.drop_list.soort, "NOTEBOOK", "NOTEBOOK", "");
addOption(document.drop_list.soort, "DESKTOP", "DESKTOP", "");
addOption(document.drop_list.soort, "SERVER", "SERVER", "");
addOption(document.drop_list.soort, "STORAGE", "STORAGE", "");
addOption(document.drop_list.soort, "IP_CAM", "IP_CAM", "");
addOption(document.drop_list.soort, "UPS", "UPS", "");
addOption(document.drop_list.soort, "NETWORK", "NETWORK", "");
}

function SelectSubCat(){
// ON selection of category this function will work

removeAllOptions(document.drop_list.merk);


if(document.drop_list.soort.value == 'MFP'){
addOption(document.drop_list.merk,"XEROX", "XEROX");
addOption(document.drop_list.merk,"RICOH", "RICOH");
addOption(document.drop_list.merk,"SHARP", "SHARP");
addOption(document.drop_list.merk,"OKI", "OKI");
addOption(document.drop_list.merk,"BROTHER", "BROTHER");
addOption(document.drop_list.merk,"CANON", "CANON");
}
if(document.drop_list.soort.value == 'PRINTER'){
addOption(document.drop_list.merk,"XEROX", "XEROX");
addOption(document.drop_list.merk,"RICOH", "RICOH");
addOption(document.drop_list.merk,"HP", "HP");
addOption(document.drop_list.merk,"OKI", "OKI");
addOption(document.drop_list.merk,"BROTHER", "BROTHER");
addOption(document.drop_list.merk,"CANON", "CANON");
}
if(document.drop_list.soort.value == 'FAX'){
addOption(document.drop_list.merk,"RICOH", "RICOH");
addOption(document.drop_list.merk,"OKI", "OKI");
addOption(document.drop_list.merk,"BROTHER", "BROTHER");
addOption(document.drop_list.merk,"CANON", "CANON");
}
if(document.drop_list.soort.value == 'NOTEBOOK'){
addOption(document.drop_list.merk,"ACER", "ACER");
addOption(document.drop_list.merk,"TOSHIBA", "TOSHIBA");
addOption(document.drop_list.merk,"DELL", "DELL");
addOption(document.drop_list.merk,"HP", "HP");
addOption(document.drop_list.merk,"SONY", "SONY");
addOption(document.drop_list.merk,"Q-FORCE", "Q-FORCE");
}
if(document.drop_list.soort.value == 'DESKTOP'){
addOption(document.drop_list.merk,"ACER", "ACER");
addOption(document.drop_list.merk,"DELL", "DELL");
addOption(document.drop_list.merk,"GATEWAY", "GATEWAY");
addOption(document.drop_list.merk,"BAREBONE", "BAREBONE");
addOption(document.drop_list.merk,"CUSTOM", "CUSTOM");
addOption(document.drop_list.merk,"Q-FORCE", "Q-FORCE");
}
if(document.drop_list.soort.value == 'SERVER'){
addOption(document.drop_list.merk,"GATEWAY", "GATEWAY");
addOption(document.drop_list.merk,"HP", "HP");
}
if(document.drop_list.soort.value == 'STORAGE'){
addOption(document.drop_list.merk,"THECUS", "THECUS");
addOption(document.drop_list.merk,"SYNOLOGY", "SYNOLOGY");
addOption(document.drop_list.merk,"GATEWAY", "GATEWAY");
addOption(document.drop_list.merk,"HITACHI", "HITACHI");
}
if(document.drop_list.soort.value == 'IP_CAM'){
addOption(document.drop_list.merk,"MOBOTIX", "MOBOTIX");
addOption(document.drop_list.merk,"PANASONIC", "PANASONIC");
addOption(document.drop_list.merk,"D-LINK", "D-LINK");
}
if(document.drop_list.soort.value == 'NETWORK'){
addOption(document.drop_list.merk,"D-LINK", "D-LINK");
addOption(document.drop_list.merk,"ALLIED_TELESIS", "ALLIED_TELESIS");
addOption(document.drop_list.merk,"CISCO/LINKSYS", "CISCO/LINKSYS");
}
}
////////////////// 

function removeAllOptions(selectbox)
{
	var i;
	for(i=selectbox.options.length-1;i>=0;i--)
	{
		//selectbox.options.remove(i);
		selectbox.remove(i);
	}
}


function addOption(selectbox, value, text )
{
	var optn = document.createElement("OPTION");
	optn.text = text;
	optn.value = value;

	selectbox.options.add(optn);
}