HI Suhaas,
this won't work as ":" is a used as selector e.g. <element>:hidden. This is the case for all selector characters (., >, +, ~, #, :, etc)
You must escape the colon using "\3A" instead of ":".
#paR:rRMV:fRM:txtskypeid4 becomes
#paR\3ArRMV\3AfRM:\3Atxtskypeid4
But try to avoid using the ID field, it would become a nightmare in case of you change something in the HTML document structure as the ID would change. The easiest way to handle it is to assign a class name and apply the logic based on classnames (especaially if you can change the ID, then you definetely can also just apply a class as well). You can also use the logic Daniel recommendet, but make sure that the used component & ID is not rendered several times in your document. But keep in mind, ends-with is a CSS3 feature and it might not work in older browsers versions like IE8.