prices = new Array(
		new Array(
			 new Array(' - maak een keuze -','')
			,new Array('< 200.000','1,200000')
			,new Array('200.000 - 300.000','200000,300000')
			,new Array('300.000 - 400.000','300000,400000')
			,new Array('400.000 - 500.000','400000,500000')
			,new Array('> 500.000','500000')
			),
			
				new Array(
			 new Array(' - maak een keuze - ','')
			 , new Array('< 500', '1,500')
			,new Array('500 - 700','500,700')
			, new Array('700 - 900','700,900')
			,new Array('900 - 1000','900,1000')
			,new Array('> 1.000','1000')
			))		
		
			
			
			
 	function changePrices(){
 		f = document.forms['search'];
 		if (f.forsale.value == 'true')
 			{
 			fillSelectFromArray(f.prices, prices[0],0);  
 			}
 		else
 			{
 			 	if(f.forsale.value == 'false')
 			 		{
 			 		fillSelectFromArray(f.prices, prices[1],0);  
 					
 					}
 				else 
 					{
 					fillSelectFromArray(f.prices, prices[0],0);  
 					} 
 			}
 		
 	  } 
 	
 	function fillSelectFromArray(selectCtrl, itemArray, defaultItem, goodPrompt,badPrompt ) {
		
		var i, j;
		var prompt;

		// empty existing items
		
		if (selectCtrl.options.length > 0){
			for (i = selectCtrl.options.length; i >= 0; i--) {
			selectCtrl.options[i] = null; 
			}
		}
		prompt = (itemArray != null) ? goodPrompt : badPrompt;
		if (prompt == null) {
			j = 0;
		} else {		
			selectCtrl.options[0] = new Option(prompt);
			j = 1;
		}
		if (itemArray != null) {
			// add new items
			for (i = 0; i < itemArray.length; i++) {
				selectCtrl.options[j] = new Option(itemArray[i][0]);
				if (itemArray[i][1] != null) {
					selectCtrl.options[j].value = itemArray[i][1]; 
				}
				j++;
			}
			// select first item (prompt) for sub list
			selectCtrl.options[defaultItem].selected = true;
		}
		
	}