Set width-height-left-top dynamically in Safari

Set width-height-left-top dynamically in Safari

I'm trying to set size and position of dynamically generated elements with
jQuery or inline css, but Safari just doesn't use it.
This is the example for jQuery:
$("#e"+i).css("width", var1).css("height", var1).css("left",
varcleft+'px').css("top", -(varleft/2)+'px').css("z-index", var1);
NOTE:I'm using the +"px" because positions are previously set with
percentages. I use something similar for inline style, but Safari still
ignore it. Any ideas on how to make that work in Safari? Thanks