title: Magento Special price validation
body: <p>Sorry that I'm a total newbie in magento.</p>
  
  <p>I have a multi-vendor magento site where vendors can create product. But when setting product price some users often do some mistakes. Some times special prices are higher than original price. I like to check this mistake. I want a validation script so that when vendors (who have limited admin access) create a new product then they should keep a minimum difference between special price and original price where special price is always lower than original price.</p>
  
  <p>Can any body give some hints?</p>
  
  <p>Thanks</p>