function checkSearch() { 
emptyfields = ""; 

if (document.searchProperties.minBedrooms.value == "") { 
emptyfields += "\n - min bedrooms"; 
} 
if (document.searchProperties.postalArea.value == "") { 
emptyfields += "\n - area required"; 
} 
if (document.searchProperties.weeklyRent.value == "") { 
emptyfields += "\n - max rent"; 
}  

if (emptyfields!= "") { 
emptyfields = "please complete the following fields:\n" + 
emptyfields + "\n\n"; 
alert(emptyfields); 
return false; 
} 
else return true; 
}