function getRandMain(range) {
return Math.round(Math.random() * range);
}
ad = new Array();
ad[0] = "By using a database on email forms in your web site you can store clients' data such as their emails and use that to build your own customer emailing list.";
ad[1] = "By hosting your web site in a Linux server will be cheaper than hosting in a Windows server. They both have their pros and cons but at the end of the day it all depends on the needs and features of the web site.";
ad[2] = "By having a custom built application for your business will save you more money and time on the long run than having to take an out of the box application and try to fit your needs to it.";
ad[3] = "Sometimes you can save even more money to have a custom built application for your company and lease the application instead of buying the application along with a maintenance agreement. 99.9% of the time when leasing an application the maintenance is already included in the contract and the total cost will be lower than owning the application.";
ad[4] = "By developing your web site using ASP or PHP will make the web site more interactive than developing it in plain HTML. Users find themselves in a more friendly web environment when it comes to interactive web sites.";
num = getRandMain(4); 
document.write(ad[num]);