User clicks on transaction launcher link user doesn't want to enter user name password ,directly url will be opened how?

Hi Team,

I have created Transaction launcher URL,if user clicks URL link ,but it asking every time user name and password dialog box.but i wont to enter user name password, i wont user enter URL direct web page will be opened how to do it,please find the below URL..could you please help here.

http://retailsapt20.lt.com:8000/sap/bc/gui/sap/its/webgui/!?~transaction=IC_LTXE&~okcode=ICEXECUTE&sap-client=217&sap-language=EN&sap-user=toye&sap-password=1234217

Thanks & Regards

kalpana