setting focus end of line

Hi Experts,

I have the following code for setting focus to the first input element.

<script>
			$(document).ready(function() {
    			var first_input = $('input[type=text]:visible:enabled:first, textarea:visible:enabled:first')[0];
    			
    			if(first_input != undefined){ 
    				
    				first_input.focus();
    				
    			}
			});
</script>

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I put that in inside of head tag, so it can handle many different forms.
Now, I am trying to set focus end of line if there is already user input. Since there is no id for  most text fields and text areas, how do I handle that?
Isn't .get() function doesn't work either.

thanks in advance