function fillCategory(){ 
 // this function is used to fill the category list on load
addOption(document.buscar_menu.tipo, "Venta", "Venta", "");
addOption(document.buscar_menu.tipo, "Arriendo", "Arriendo", "");
}

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

removeAllOptions(document.buscar_menu.Rango);
addOption(document.buscar_menu.Rango, "", "Rango", "");

if(document.buscar_menu.tipo.value == 'Venta'){
addOption(document.buscar_menu.Rango,"Mango", "Mango");
addOption(document.buscar_menu.Rango,"Banana", "Banana");
addOption(document.buscar_menu.Rango,"Orange", "Orange");
}
if(document.buscar_menu.tipo.value == 'Arriendo){
addOption(document.buscar_menu.Rango,"Cricket", "Cricket");
addOption(document.buscar_menu.Rango,"Football", "Football");
addOption(document.buscar_menu.Rango,"Polo", "Polo", "");
}

}
////////////////// 

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);
}