Retrieve a Value, do a loop and Search by Key() -- in XSL only

[Mertah]

Hello All,
My question is to know FIRST how to retrieve (to get) a value of <INPUT type="text"...> using XSL into my xsl variable, this value contains text strings separated by semi-column ";" like (" toto; ameli; CCLAS; javascript; PHP; ASP Classic"). Then I want (SECOND TIME) to loop based on this string after transformed in table with 6 elements (only on XSL). Finally, within this loop how to search for KEY( ) function in each of its values.
To simplify my problem can be divided into 3 parts:
1 - how to get in XSL, the value of the input into my XSL variable called myValue.
2 - how to split, always in XSL myValue by the separator ";" . And make a loop, I call myLoop thereupon .
3 - inside my loop myLoop varying the value of my key search KEY() - always XSL .

Any help is welcome , for what it's been awhile since I try resolve this problem but I did not find what I wanted.

Thank you in advance