Excel Chart Help

i have three columns:  year, customer name, amount billed

i have 10 rows for each of the past three years for a total of 30 rows.

i need help presenting this in a line chart - i want a line indicating the activity of each customer for each year.

the x-axis should be the year, the y-axis is amount billed, and the line itself should be the customer name.

i am not an Excel person at all - enough to be dangerous and i can't get the graph that i have pictured in my mind... can someone please help me?

i have excel 2007.

thanks.