add size attribute to sites

currently i have an option for men size svoes in oscommerce when adding a product. now when creating a new item in admin i want to have 3 size options to choose from. i want to be able to select current men size attribute, or new listing - women (5,5.5,6,7,7.5,8,8.5) or new listing - s,m,l,xxl (i need this done for 2 websites) --------- also i need yahoo analytics tag inserted into header section of my thank you page so i can see what customers are ordering from what keywords exactly. i have html code to give i just need it to be inserted correctl. i tired but i guess i am adding it to incorrect page through my cpanel so it is not working.