function switch_img(index){
	if(index == '1'){
		if(document.getElementById('checkbox_img1').src == 'images/checkbox_checked.gif'){
			document.getElementById('checkbox_img1').src = 'images/checkbox_unchecked.gif';
			document.getElementById('checkbox_img2').src = 'images/checkbox_checked.gif';
			document.getElementById('condition').value = 'second_hand';		
		}
		else{
			document.getElementById('checkbox_img1').src = 'images/checkbox_checked.gif';
			document.getElementById('checkbox_img2').src = 'images/checkbox_unchecked.gif';
			document.getElementById('condition').value = 'new';			
		} 	
	}
	else{
		if(document.getElementById('checkbox_img2').src == 'images/checkbox_checked.gif'){
			document.getElementById('checkbox_img2').src = 'images/checkbox_unchecked.gif';
			document.getElementById('checkbox_img1').src = 'images/checkbox_checked.gif';
			document.getElementById('condition').value = 'new';		
		}
		else{
			document.getElementById('checkbox_img2').src = 'images/checkbox_checked.gif';
			document.getElementById('checkbox_img1').src = 'images/checkbox_unchecked.gif';
			document.getElementById('condition').value = 'second_hand';			
		} 		
		
	}
}

function plans_details_show(details_block){
    if(document.getElementById(details_block).style.display == 'none') document.getElementById(details_block).style.display = 'block';
    else document.getElementById(details_block).style.display = 'none';    
}